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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Cash paid											$ 55,493
Seller Obligations									$ 7,540	$ 5,128	4,459
Total Purchase Price											59,952
Revenue	$ 353,121	$ 348,999	$ 332,584	$ 301,728	$ 299,869	$ 295,193	$ 282,196	$ 255,669	1,336,432	1,132,927	862,980
Net (Loss) Income	16,476	$ 15,563	$ 16,315	$ 6,394	10,793	$ 12,010	$ 11,973	$ 6,364	$ 54,748	$ 41,140	$ 38,436
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									11,466
Net (Loss) Income									$ 531
AFT Acquisition [Member]
Business Acquisition [Line Items]
Date									Oct. 31, 2018
Acquisition Type									Asset
Cash paid									$ 19,707
Seller Obligations									1,510
Total Purchase Price									21,217
Revenue									3,530
Net (Loss) Income									$ (13)
Other Acquisition [Member]
Business Acquisition [Line Items]
Acquisition Type									Shares/Asset	Asset	Asset
Cash paid									$ 28,593	$ 15,645	$ 18,753
Seller Obligations									4,057	2,419	2,299
Total Purchase Price									32,650	18,064	21,052
Revenue									24,329	20,457	19,974
Net (Loss) Income									639	573	(592)
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Cash paid									57,740	137,367	55,493
Seller Obligations									7,540	5,128	$ 4,459
Fair Value of Common Stock Issued					10,859					10,859
Total Purchase Price									65,280	$ 153,354
2018 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue									39,325
Net (Loss) Income									1,157
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										116,070
Net (Loss) Income										$ (1,148)
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										6,046
Net (Loss) Income										86
2017 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue										144,402
Net (Loss) Income										$ (478)
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										1,829
Net (Loss) Income										$ 11
Alpine Insulation Co Inc [Member]
Business Acquisition [Line Items]
Date											Apr. 12, 2016
Acquisition Type											Asset
Cash paid											$ 21,151
Seller Obligations											1,560
Total Purchase Price											22,711
Revenue											21,359
Net (Loss) Income											$ 1,370
East Coast Insulators II, L.L.C [Member]
Business Acquisition [Line Items]
Date											Oct. 17, 2016
Acquisition Type											Asset
Cash paid											$ 15,589
Seller Obligations											600
Total Purchase Price											16,189
Revenue											4,701
Net (Loss) Income											21
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue											46,034
Net (Loss) Income											$ 799

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