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Classification of Net Deferred Income Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Balance Sheet Classification of Deferred Income Tax Assets and Liabilities [Line Items] |  |
Net deferred income tax assets | $ 455,712 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 454,210 us-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 | 195,841 us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember | 195,872 us-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 | 385,434 us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember | 373,638 us-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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- Definition 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 + Details
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