Goodwill and Identifiable Intangible Assets - Summary of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 45,257	$ 40,263
Accumulated Amortization	(15,555)	(12,020)
Net Carrying Amount	29,702	28,243
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,393	21,200
Accumulated Amortization	(4,736)	(3,220)
Net Carrying Amount	20,657	17,980
Developed technologies
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,667	6,497
Accumulated Amortization	(4,740)	(3,891)
Net Carrying Amount	1,927	2,606
Trade name and other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,197	12,566
Accumulated Amortization	(6,079)	(4,909)
Net Carrying Amount	$ 7,118	$ 7,657