Goodwill and Identifiable Intangible Assets - Summary of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 46,841	$ 40,263
Accumulated Amortization	(17,574)	(12,020)
Net Carrying Amount	29,267	28,243
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	26,176	21,200
Accumulated Amortization	(5,562)	(3,220)
Net Carrying Amount	20,614	17,980
Developed technologies
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,049	6,497
Accumulated Amortization	(5,214)	(3,891)
Net Carrying Amount	1,835	2,606
Trade name and other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,616	12,566
Accumulated Amortization	(6,798)	(4,909)
Net Carrying Amount	$ 6,818	$ 7,657