Business Combinations - Summary of the Purchase Price Preliminarily Allocated to the Intangible Assets Acquired for the Acquisitions (Details) - USD ($) $ in Thousands	1 Months Ended					12 Months Ended
	Dec. 31, 2016	Aug. 31, 2016	Jul. 31, 2016	Mar. 31, 2015	Feb. 28, 2015	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life						9 years
ARAS
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life					5 years
Finite-lived Intangible Assets Acquired					$ 5,351
ARAS | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life					5 years
Finite-lived Intangible Assets Acquired					$ 509
ARAS | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life					4 years
Finite-lived Intangible Assets Acquired					$ 540
ARAS | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life					5 years
Finite-lived Intangible Assets Acquired					$ 2,052
ARAS | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life					7 years
Finite-lived Intangible Assets Acquired					$ 2,250
Kubit
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life				5 years
Finite-lived Intangible Assets Acquired				$ 2,571
Kubit | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life				6 years
Finite-lived Intangible Assets Acquired				$ 658
Kubit | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life				3 years
Finite-lived Intangible Assets Acquired				$ 272
Kubit | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life				5 years
Finite-lived Intangible Assets Acquired				$ 945
Kubit | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life				6 years
Finite-lived Intangible Assets Acquired				$ 696
BuildIT
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life			7 years
Finite-lived Intangible Assets Acquired			$ 1,015
BuildIT | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life			7 years
Finite-lived Intangible Assets Acquired			$ 346
BuildIT | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life			5 years
Finite-lived Intangible Assets Acquired			$ 31
BuildIT | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life			7 years
Finite-lived Intangible Assets Acquired			$ 361
BuildIT | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life			7 years
Finite-lived Intangible Assets Acquired			$ 277
LPT
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life		7 years
Finite-lived Intangible Assets Acquired		$ 5,474
LPT | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life		1 year
Finite-lived Intangible Assets Acquired		$ 64
LPT | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life		0 years
Finite-lived Intangible Assets Acquired		$ 0
LPT | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life		7 years
Finite-lived Intangible Assets Acquired		$ 4,260
LPT | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life		7 years
Finite-lived Intangible Assets Acquired		$ 1,150
MWF
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life	5 years
Finite-lived Intangible Assets Acquired	$ 1,816
MWF | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life	1 year
Finite-lived Intangible Assets Acquired	$ 36
MWF | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life	2 years
Finite-lived Intangible Assets Acquired	$ 3
MWF | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life	5 years
Finite-lived Intangible Assets Acquired	$ 951
MWF | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life	5 years
Finite-lived Intangible Assets Acquired	$ 826