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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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Change in fair value:
Recognized in earnings	$ (5)	$ 51	$ (7)	$ 61
Recognized in other comprehensive income	(420)	1,763	(647)	2,264
Total change in fair value	$ (425)	$ 1,814	$ (654)	$ 2,325

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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