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Fair Value of Financial Instruments - Changes in Fair Value of Swaps (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Change in fair value:
Recognized in earnings	$ 1	$ 46	$ (6)	$ 107
Recognized in other comprehensive income	374	(12)	(273)	2,252
Total change in fair value	$ 375	$ 34	$ (279)	$ 2,359

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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