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Income Taxes - Reconciliation of Valuation Allowance (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation Allowance [Line Items]        
Balance at the beginning of the period   $ 140,915 $ 154,252 $ 152,138
Charged to provision for income taxes   2,305 (13,292) 2,704
Foreign currency   (313) 45 590
Deductions   0 0 0
Release valuation allowance $ 141,100 141,094    
Balance at the end of the period $ 5,368 $ 5,368 140,915 $ 154,252
Accounting Standards Update 2016-09        
Valuation Allowance [Line Items]        
Adoption of ASU 2016-09     $ 2,929