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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]      
Beginning balance $ 18,413 $ 17,384 $ 27,522
Reductions 0 0 0
Reductions (802) 0 (11,110)
Settlements 0 0 0
Lapses in statute of limitations 0 0 0
Ending balance 20,483 18,413 17,384
Federal [Member]      
Income Tax Contingency [Line Items]      
Tax positions related to current year, Additions 1,206 530 529
Tax positions related to prior year, Additions 0 0 0
State [Member]      
Income Tax Contingency [Line Items]      
Tax positions related to current year, Additions 1,666 499 443
Tax positions related to prior year, Additions 0 0 0
Foreign [Member]      
Income Tax Contingency [Line Items]      
Tax positions related to prior year, Additions $ 0 $ 0 $ 0