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Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 600,636	$ 665,309
Restricted cash and cash equivalents	199,764	187,585
Investments	2,151	3,915
Debt	(861,339)	(864,469)
Forward contracts	(58,456)	(46,912)
Fair value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	600,636	665,309
Restricted cash and cash equivalents	199,764	187,585
Investments	2,151	3,915
Debt	(773,619)	(737,980)
Forward contracts	$ (58,456)	$ (46,912)

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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