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Other Comprehensive Loss - Changes in Accumulated OCI by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, December 31, 2014			$ (7,352)
Other comprehensive income before reclassifications			386
Change in cash flow hedges reclassed to earnings	$ 154	$ 118	829	$ 236
Net current-period other comprehensive income			1,215
Balance, June 30, 2015	(6,137)		(6,137)
Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, December 31, 2014			(8,485)
Other comprehensive income before reclassifications			320
Change in cash flow hedges reclassed to earnings			829
Net current-period other comprehensive income			1,149
Balance, June 30, 2015	(7,336)		(7,336)
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, December 31, 2014			1,133
Other comprehensive income before reclassifications			66
Change in cash flow hedges reclassed to earnings			0
Net current-period other comprehensive income			66
Balance, June 30, 2015	$ 1,199		$ 1,199

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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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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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