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Income Taxes - Uncertain Tax Positions Roll Forward (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at the beginning of the period $ 5,843 $ 9,964 $ 14,450
Net reductions for settlement of tax audits   (22) (828)
Net reductions for lapse of statutes taken during the period (436) (5,178) (4,998)
Net additions for tax positions taken during the prior period 17,651    
Net additions for tax positions taken during the current period 3,050 1,079 1,340
Balance at the end of the period $ 26,108 $ 5,843 $ 9,964