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Income Taxes - Reconciliation of Beginning and Ending Amount of Uncertain Tax Positions (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Balance at beginning of year $ 657 $ 2,409 $ 2,292
Additions based on tax positions related to the current year 70 45 97
Additions based on tax positions of prior years 13 367 255
Reductions for tax positions of prior years (443) (1,411) (123)
Settlements (38) (753) (112)
Balance at end of year $ 259 $ 657 $ 2,409