Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail)

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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Gains and Losses on Cash Flow Hedges [Member]
Jun. 30, 2014
Defined Benefit Pension Plan [Member]
Dec. 31, 2013
Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Balance at December 31, 2013     $ (8,582)   $ (8,859) $ 277 $ 277
Other comprehensive income (loss) before reclassifications     (2,959)   (2,959)    
Amounts reclassified out of accumulated other comprehensive income (loss)     3,694   3,694    
Other comprehensive income (loss) (302) 6,290 735 8,077 735    
Balance at June 30, 2014 $ (7,847)   $ (7,847)   $ (8,124) $ 277 $ 277