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Income Taxes - Change in Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Balance, beginning of period $ 3,016 $ 3,016
Additions for tax positions related to prior years 0 0
Reductions due to lapse of statue of limitations (156) 0
Settlement with tax authorities (1,185) 0
Balance, end of period $ 1,675 $ 3,016