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Income Taxes - Reconciliation Of Changes In Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Unrecognized tax benefits at January 1, $ 6,684 $ 4,648
Increases for positions taken during current period 1,968 1,074
Increases for positions taken during prior periods 481 62
Decreases for positions taken during prior periods (1,476) (438)
Acquired unrecognized tax benefits 0 1,374
Lapse of statute of limitations 0 (8)
Settlements with taxing authorities 0 (28)
Unrecognized tax benefits at December 31, $ 7,657 $ 6,684