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Deferred Tax Assets and Liabilities Recognized in Company's Consolidated Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Deferred tax asset — other current assets $ 39,305us-gaap_DeferredTaxAssetsNetCurrent $ 34,151us-gaap_DeferredTaxAssetsNetCurrent
Deferred tax asset — other noncurrent assets 3,080us-gaap_DeferredTaxAssetsNetNoncurrent 4,284us-gaap_DeferredTaxAssetsNetNoncurrent
Total deferred tax assets 42,385us-gaap_DeferredTaxAssetsNet 38,435us-gaap_DeferredTaxAssetsNet
Deferred tax liability — accrued expenses (57)us-gaap_DeferredTaxLiabilitiesCurrent 0us-gaap_DeferredTaxLiabilitiesCurrent
Noncurrent deferred tax liability — deferred income taxes (130,368)us-gaap_DeferredTaxLiabilitiesNoncurrent (144,908)us-gaap_DeferredTaxLiabilitiesNoncurrent
Total deferred tax liabilities (130,425)us-gaap_DeferredTaxLiabilities (144,908)us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities $ (88,040)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (106,473)us-gaap_DeferredTaxAssetsLiabilitiesNet