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Income Taxes - Expiration of Loss and Tax Credit Carryforwards (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Operating Loss and Tax Credit Carryforward [Line Items]
Loss carryforwards	$ 640,608
Tax credit carryforwards	50,309
Period of Expiration 2015 - 2019
Operating Loss and Tax Credit Carryforward [Line Items]
Loss carryforwards	76,686
Tax credit carryforwards	684
Period of Expiration Thereafter
Operating Loss and Tax Credit Carryforward [Line Items]
Loss carryforwards	316,722
Tax credit carryforwards	45,682
No Expiration Date
Operating Loss and Tax Credit Carryforward [Line Items]
Loss carryforwards	247,200
Tax credit carryforwards	$ 3,943