Quarterly report pursuant to Section 13 or 15(d)

Income Tax Expense - Additional Information (Detail)

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Income Tax Expense - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Taxes [Line Items]        
Income tax expense $ 7,933,000 $ 398,000 $ 11,177,000 $ 544,000
Reduction of income tax expense due to implementation of a global tax platform (6,600,000)   (6,600,000)  
Expense due to change in U.S. tax status
       
Income Taxes [Line Items]        
Income tax expense     4,200,000  
Debt prepayments
       
Income Taxes [Line Items]        
Income tax expense     $ 2,600,000