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Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets And Liabilities [Line Items]
Current deferred income tax benefits	$ 74,821	$ 77,716
Noncurrent deferred income taxes	(279,999)	(225,592)
Net deferred income taxes	$ (205,178)	$ (147,876)

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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