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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Seller Obligations			$ 5,420	$ 3,759
Revenue	$ 348,999	$ 295,193	983,311	833,058
Net income	15,563	12,010	$ 38,272	$ 30,347
CDG Acquisition [Member]
Business Acquisition [Line Items]
Date			Mar. 19, 2018
Acquisition Type			Asset
Cash paid			$ 9,440
Seller Obligations			1,973
Total Purchase Price			11,413
Revenue	3,848		7,572
Net income	164		$ 229
Other Acquisition [Member]
Business Acquisition [Line Items]
Acquisition Type			Shares/Asset	Asset
Cash paid			$ 25,242	$ 9,812
Seller Obligations			3,447	1,042
Total Purchase Price			28,689	10,854
Revenue	7,003	6,499	12,782	11,671
Net income	42	84	423	366
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Cash paid			34,682	131,534
Seller Obligations			5,420	3,751
Fair Value of Common Stock Issued		10,859		10,859
Total Purchase Price			40,102	$ 146,144
2018 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue	10,851		20,354
Net income	206		652
Alpha [Member]
Business Acquisition [Line Items]
Date				Jan. 05, 2017
Acquisition Type				Share
Cash paid				$ 103,810
Seller Obligations				2,002
Fair Value of Common Stock Issued	$ 10,900	10,859	$ 10,900	10,859
Total Purchase Price				116,671
Revenue		29,334		87,830
Net income		(271)		$ 190
Columbia [Member]
Business Acquisition [Line Items]
Date				Jun. 26, 2017
Acquisition Type				Asset
Cash paid				$ 8,768
Seller Obligations				225
Total Purchase Price				8,993
Revenue		3,026		3,241
Net income		73		80
2017 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue		39,123		103,006
Net income		(68)		$ 682
Astro [Member]
Business Acquisition [Line Items]
Date				Sep. 18, 2017
Acquisition Type				Asset
Cash paid				$ 9,144
Seller Obligations				482
Total Purchase Price				9,626
Revenue		264		264
Net income		$ 46		$ 46

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