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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	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before reclassifications, net of taxes	$ 2,846	$ 3,151	$ 1,020
Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balances	(5,716)	(8,867)	(12,357)
Other comprehensive loss before reclassifications, net of taxes	(3,169)	(2,668)	(11,959)
Amounts reclassified from accumulated other comprehensive loss to interest expense, net of taxes	6,015	5,819	15,449
Net other comprehensive income	2,846	3,151	3,490
Ending balances	$ (2,870)	$ (5,716)	$ (8,867)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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- Definition

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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