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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive loss before reclassifications, net of taxes $ 115 $ (79) $ 2,481 $ (35)
Net other comprehensive income     2,481 (35)
Interest Rate Swap
       
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balances (6,501) (10,338) (8,867) (12,358)
Other comprehensive loss before reclassifications, net of taxes (1,352) (5,000) (1,866) (11,219)
Amounts reclassified from accumulated other comprehensive loss to interest expense 1,467 5,415 4,347 13,654
Net other comprehensive income 115 415 2,481 2,435
Ending balances $ (6,386) $ (9,923) $ (6,386) $ (9,923)