Annual report pursuant to Section 13 and 15(d)

Changes in Accumulated Other Comprehensive Loss, Net of Taxes, Related to Interest Rate Swap Agreements (Detail)

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Changes in Accumulated Other Comprehensive Loss, Net of Taxes, Related to Interest Rate Swap Agreements (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive gain (loss) before reclassifications, net of taxes $ 2,636 $ 2,846 $ 3,151
Interest Rate Swap      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balances (2,870) (5,716) (8,867)
Other comprehensive gain (loss) before reclassifications, net of taxes (2,154) (3,169) (2,668)
Amounts reclassified from accumulated other comprehensive loss to interest expense, net of taxes 4,790 6,015 5,819
Net other comprehensive income 2,636 2,846 3,151
Ending balances $ (234) $ (2,870) $ (5,716)