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Summary of Option Activity (Detail) (USD $)
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3 Months Ended |
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Mar. 31, 2013
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Time Based Units
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| Number of Share Option Awards | |
| Granted | 1,671,113 |
| Forfeited | |
| Exercised | |
| Outstanding as of March 31, 2013 | 1,671,113 |
| Vested as of March 31, 2013 | 734,226 |
| Non-vested as of March 31, 2013 | 936,887 |
| Weighted-Average Exercise Price | |
| Granted | $ 19.00 |
| Forfeited | |
| Exercised | |
| Outstanding as of March 31, 2013 | $ 19.00 |
| Vested as of March 31, 2013 | $ 19.00 |
| Non-vested as of March 31, 2013 | $ 19.00 |
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Performance-Based Units
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| Number of Share Option Awards | |
| Granted | 1,579,939 |
| Forfeited | |
| Exercised | |
| Outstanding as of March 31, 2013 | 1,579,939 |
| Non-vested as of March 31, 2013 | 1,579,939 |
| Weighted-Average Exercise Price | |
| Granted | $ 19.00 |
| Forfeited | |
| Exercised | |
| Outstanding as of March 31, 2013 | $ 19.00 |
| Non-vested as of March 31, 2013 | $ 19.00 |
| X | ||||||||||
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- Definition
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number No definition available.
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- Definition
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Exercise Price No definition available.
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- Definition
Share Based Compensation Arrangement by Share Based Payment Award, Options, Vested in Period No definition available.
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| X | ||||||||||
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- Definition
Share Based Compensation Arrangement By Share Based Payment Award Options Vested Weighted Average Exercise Price No definition available.
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| X | ||||||||||
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- Definition
The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded. No definition available.
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| X | ||||||||||
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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