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Income Taxes - Expiration of Loss and Tax Credit Carryforwards (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Operating Loss and Tax Credit Carryforward [Line Items]  
Document Period End Date Dec. 31, 2018
Loss Carryforwards $ 662,010
Tax Credit Carryforwards 64,857
Period of Expiration 2019 - 2023  
Operating Loss and Tax Credit Carryforward [Line Items]  
Loss Carryforwards 8,190
Tax Credit Carryforwards 2,837
Thereafter  
Operating Loss and Tax Credit Carryforward [Line Items]  
Loss Carryforwards 213,629
Tax Credit Carryforwards 39,871
No expiration date  
Operating Loss and Tax Credit Carryforward [Line Items]  
Loss Carryforwards 440,191
Tax Credit Carryforwards $ 22,149