Business Combinations, Goodwill and Intangible Assets - Summary of Company's Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	$ 108,547	$ 108,884
Accumulated Amortization	(68,277)	(60,826)
Total	40,270	48,058
Total intangible assets, gross carrying amount	109,447	109,784
Total intangible assets, net carrying amount	41,170	48,958
Trade names and trademarks
Indefinite-lived Intangible Assets [Line Items]
Trade names and trademarks	900	900
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	82,063	82,165
Accumulated Amortization	(48,842)	(43,667)
Total	33,221	38,498
Leasehold benefits
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	2,694	2,888
Accumulated Amortization	(2,518)	(2,596)
Total	176	292
Developed technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	15,800	15,835
Accumulated Amortization	(10,657)	(8,749)
Total	5,143	7,086
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	2,045	2,045
Accumulated Amortization	(1,861)	(1,780)
Total	184	265
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	5,945	5,951
Accumulated Amortization	(4,399)	(4,034)
Total	$ 1,546	$ 1,917