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Changes in Accumulated Other Comprehensive Loss, Net of Taxes, Related to Interest Rate Swap Agreements (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
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications, net of taxes $ 661 $ 1,590 $ 1,158 $ 2,366
Net other comprehensive income     1,158 2,366
Interest Rate Swap
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balances (5,219) (8,091) (5,716) (8,867)
Other comprehensive income (loss) before reclassifications, net of taxes (848) 122 (1,827) (514)
Amounts reclassified from accumulated other comprehensive loss to interest expense, net of taxes 1,509 1,468 2,985 2,880
Net other comprehensive income 661 1,590 1,158 2,366
Ending balances $ (4,558) $ (6,501) $ (4,558) $ (6,501)