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Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets Liabilities [Line Items]    
Carry forward tax losses $ 213,880us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 235,942us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Employee stock based compensation 23,950us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 19,846us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Other 46,356us-gaap_DeferredTaxAssetsOther 33,992us-gaap_DeferredTaxAssetsOther
Deferred tax assets before valuation allowance 284,186us-gaap_DeferredTaxAssetsGross 289,780us-gaap_DeferredTaxAssetsGross
Valuation allowance (213,690)us-gaap_DeferredTaxAssetsValuationAllowance (234,600)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax asset 70,496us-gaap_DeferredTaxAssetsNet 55,180us-gaap_DeferredTaxAssetsNet
Intangible assets (7,901)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (7,773)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Undistributed earnings of subsidiary (11,435)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings (10,788)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Other (3,121)us-gaap_DeferredTaxLiabilitiesOther (1,638)us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liability (22,457)us-gaap_DeferredTaxLiabilities (20,199)us-gaap_DeferredTaxLiabilities
Deferred tax asset, net 48,039us-gaap_DeferredTaxAssetsLiabilitiesNet 34,981us-gaap_DeferredTaxAssetsLiabilitiesNet
Current deferred tax asset, net 34,175us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 21,732us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Non-current deferred tax asset, net 14,368us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 13,557us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Non-current deferred tax liability, net (504)us-gaap_DeferredTaxLiabilitiesNoncurrent (308)us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred tax asset, net $ 48,039us-gaap_DeferredTaxAssetsLiabilitiesNet $ 34,981us-gaap_DeferredTaxAssetsLiabilitiesNet