Summary of Significant Accounting Policies - Summary of Reconciliation of Contingent Consideration (Detail) - USD ($) $ in Thousands		12 Months Ended			20 Months Ended
	May 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Schedule Of Reconciliation Of Contingent Consideration [Line Items]
Revaluation adjustments		$ 1,000
Payments of earn-out liability		(1,373)	$ (870)	$ 0
JBBR Acquisition [Member]
Schedule Of Reconciliation Of Contingent Consideration [Line Items]
Beginning balance		18,830	0
Initial Valuation	$ 19,700		19,700
Revaluation adjustments		1,043	0
Payments of earn-out liability		(1,873)	(870)		$ (2,700)
Ending balance	$ 19,700	$ 18,000	$ 18,830	$ 0	$ 18,000