Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Changes in Liability Related to Unrecognized Tax Benefits (Detail)

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Income Taxes - Summary of Changes in Liability Related to Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Unrecognized tax benefit liability, Beginning Balance $ 5,740 $ 6,693 $ 9,097
Prior period positions:      
Increases 175 181 409
Decreases   (66) (233)
Increases from current period positions 184 195 799
Settlements   (897) (1,721)
Lapse of statute of limitations (1,114) (170) (1,164)
Other (230) (196) (494)
Unrecognized tax benefit liability, Ending Balance $ 4,755 $ 5,740 $ 6,693