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Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Gross unrecognized tax benefits, beginning of the year $ 9,318 $ 13,900 $ 24,479
Additions for tax positions of prior years 19 129 3,582
Reductions for tax positions of prior years (20)    
Additions for tax positions related to the current year 864 931 813
Reductions due to settlements   (4,064) (13,707)
Reductions due to lapse of applicable statute of limitations (2,444) (1,578) (1,267)
Subtotal 7,737 9,318 13,900
Interest and penalties 1,986 2,820 3,107
Total gross unrecognized tax benefits, end of the year $ 9,723 $ 12,138 $ 17,007