Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Amounts Recognized Within Assets and Liabilities Based on Right of Offset (Detail)

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Fair Value Measurements and Derivatives - Amounts Recognized Within Assets and Liabilities Based on Right of Offset (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Gross Amounts $ 11,524 $ 27,471
Gross Amounts Offset (243) (1,065)
Total Net Amounts 11,281 26,406
Gross Amounts Not Offset (88) (15,126)
Net Amounts 11,193 11,280
Gross Amounts 6,808 19,478
Gross Amounts Offset (14)   
Total Net Amounts 6,794 19,478
Gross Amounts Not Offset (6,782) (19,478)
Net Amounts $ 12