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Classification of Net Deferred Income Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items]
Net deferred income tax assets	$ 455,712us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 454,210us-gaap_DeferredTaxAssetsLiabilitiesNet
Prepaid expenses and other current assets
Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items]
Net deferred income tax assets	195,841us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember	195,872us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
Other noncurrent assets
Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items]
Net deferred income tax assets	385,434us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember	373,638us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember
Accrued liabilities
Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items]
Net deferred income tax assets	(181)us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember	(109)us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember
Other noncurrent liabilities
Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items]
Net deferred income tax assets	$ (125,382)us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	$ (115,191)us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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