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Income Taxes - Expense (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current tax provision:      
Federal $ 610 $ 541 $ 271
State 1,259 543 431
Foreign 6,135 7,289 4,393
Current tax provision (benefit) 8,004 8,373 5,095
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal 20,746 (129,405) (41)
State (1,127) (10,693) 113
Foreign (1,235) (836) 328
Deferred tax expense (benefit) 18,384 (140,934) 400
Income tax provision $ 26,388 $ (132,561) $ 5,495