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
	Apr. 30, 2017	Dec. 31, 2016	Aug. 31, 2016	Jul. 31, 2016	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired, weighted average life					8 years
BuildIt
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 1,015
Intangible assets acquired, weighted average life				7 years
BuildIt | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 346
Intangible assets acquired, weighted average life				7 years
BuildIt | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 31
Intangible assets acquired, weighted average life				5 years
BuildIt | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 361
Intangible assets acquired, weighted average life				7 years
BuildIt | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired				$ 277
Intangible assets acquired, weighted average life				7 years
LPT
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 5,474
Intangible assets acquired, weighted average life			7 years
LPT | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 64
Intangible assets acquired, weighted average life			1 year
LPT | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 4,260
Intangible assets acquired, weighted average life			7 years
LPT | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 1,150
Intangible assets acquired, weighted average life			7 years
MWF
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 1,816
Intangible assets acquired, weighted average life		5 years
MWF | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 36
Intangible assets acquired, weighted average life		1 year
MWF | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 3
Intangible assets acquired, weighted average life		2 years
MWF | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 951
Intangible assets acquired, weighted average life		5 years
MWF | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 826
Intangible assets acquired, weighted average life		5 years
Nutfield
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 2,329
Intangible assets acquired, weighted average life	10 years
Nutfield | Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 29
Intangible assets acquired, weighted average life	1 year
Nutfield | Non-competition agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 144
Intangible assets acquired, weighted average life	5 years
Nutfield | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 1,970
Intangible assets acquired, weighted average life	10 years
Nutfield | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 95
Intangible assets acquired, weighted average life	10 years
Nutfield | Favorable in-place lease
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 91
Intangible assets acquired, weighted average life	12 years