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Derivative Instruments - Schedule of Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Forward Interest Rate Swaps Designated in Hedging Relationship (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivatives And Hedging Activities [Line Items]
Total accumulated other comprehensive gains (losses)	$ (8,547)	$ (9,781)	$ (10,325)	$ (4,213)
Forward Interest Rate Swap Contracts [Member]
Derivatives And Hedging Activities [Line Items]
Unrealized loss on forward interest rate swap hedging, Gross	(12,069)	0	0	0
Unrealized loss on forward interest rate swap hedging, Income tax benefit	(4,370)	0	0	0
Total accumulated other comprehensive gains (losses)	$ (7,699)	$ 0	$ 0	$ 0

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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