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Business Combinations - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Intangibles $ 76,800 $ 30,300  
Goodwill 155,466 107,086 $ 90,512
Gain on bargain purchase     (1,116)
Less seller obligations 5,128 4,459 13,180
Cash paid 137,367 55,493 85,200
Alpha [Member]      
Business Acquisition [Line Items]      
Cash 247    
Accounts receivable 29,851    
Inventories 1,852    
Other current assets 4,500    
Property and equipment 1,528    
Intangibles 57,200    
Goodwill 38,511    
Other non-current assets 383    
Accounts payable and other current liabilities (17,401)    
Fair value of assets acquired 116,671    
Less fair value of common stock issued 10,859    
Less seller obligations 2,002    
Cash paid 103,810    
Columbia [Member]      
Business Acquisition [Line Items]      
Accounts receivable 1,004    
Inventories 704    
Other current assets 8    
Property and equipment 659    
Intangibles 4,760    
Goodwill 2,184    
Other non-current assets 32    
Accounts payable and other current liabilities (358)    
Fair value of assets acquired 8,993    
Less seller obligations 225    
Cash paid 8,768    
Astro [Member]      
Business Acquisition [Line Items]      
Accounts receivable 924    
Inventories 296    
Other current assets 36    
Property and equipment 640    
Intangibles 5,168    
Goodwill 2,926    
Accounts payable and other current liabilities (364)    
Fair value of assets acquired 9,626    
Less seller obligations 482    
Cash paid 9,144    
Other Acquisition [Member]      
Business Acquisition [Line Items]      
Accounts receivable 3,195 2,502 4,093
Inventories 1,544 1,183 720
Other current assets 96 24 32
Property and equipment 1,820 1,616 1,574
Intangibles 9,688 11,067 10,534
Goodwill 4,106 5,933 4,809
Other non-current assets 234 345 60
Accounts payable and other current liabilities (2,619) (1,618) (2,220)
Deferred income tax liabilities     (825)
Fair value of assets acquired 18,064 21,052 18,777
Gain on bargain purchase     (1,116)
Total purchase price     17,661
Less seller obligations 2,419 2,299 1,621
Cash paid 15,645 18,753 16,040
Combined Business Acquisitions [Member]      
Business Acquisition [Line Items]      
Cash 247 2,181 926
Accounts receivable 34,974 9,554 14,264
Inventories 4,396 2,215 2,454
Other current assets 4,640 25 548
Property and equipment 4,647 2,938 4,867
Intangibles 76,816 30,267 55,365
Goodwill 47,727 16,921 37,104
Other non-current assets 649 461 4,118
Accounts payable and other current liabilities (20,742) (4,610) (9,773)
Deferred income tax liabilities     (6,320)
Long-term debt     (82)
Other long-term liabilities     (3,975)
Fair value of assets acquired 153,354 59,952 99,496
Gain on bargain purchase     (1,116)
Less fair value of common stock issued 10,859    
Total purchase price     98,380
Less seller obligations 5,128 4,459 13,180
Cash paid $ 137,367 55,493 85,200
Alpine [Member]      
Business Acquisition [Line Items]      
Accounts receivable   3,959  
Inventories   700  
Property and equipment   656  
Intangibles   12,800  
Goodwill   6,642  
Accounts payable and other current liabilities   (2,046)  
Fair value of assets acquired   22,711  
Less seller obligations   1,560  
Cash paid   21,151  
East Coast Insulators II, L.L.C [Member]      
Business Acquisition [Line Items]      
Cash   2,181  
Accounts receivable   3,093  
Inventories   332  
Other current assets   1  
Property and equipment   666  
Intangibles   6,400  
Goodwill   4,346  
Other non-current assets   116  
Accounts payable and other current liabilities   (946)  
Fair value of assets acquired   16,189  
Less seller obligations   600  
Cash paid   $ 15,589  
BDI Insulation [Member]      
Business Acquisition [Line Items]      
Cash     661
Accounts receivable     4,735
Inventories     980
Other current assets     368
Property and equipment     1,006
Intangibles     21,280
Goodwill     16,213
Other non-current assets     3,736
Accounts payable and other current liabilities     (3,303)
Deferred income tax liabilities     (5,495)
Other long-term liabilities     (3,736)
Fair value of assets acquired     36,445
Total purchase price     36,445
Less seller obligations     5,765
Cash paid     30,680
CQ Insulation [Member]      
Business Acquisition [Line Items]      
Cash     100
Accounts receivable     1,423
Inventories     152
Other current assets     39
Property and equipment     190
Intangibles     4,350
Goodwill     3,035
Accounts payable and other current liabilities     (1,539)
Other long-term liabilities     (238)
Fair value of assets acquired     7,512
Total purchase price     7,512
Less seller obligations     2,319
Cash paid     5,193
Layman Brothers Contracting [Member]      
Business Acquisition [Line Items]      
Accounts receivable     1,245
Inventories     267
Property and equipment     733
Intangibles     5,330
Goodwill     3,143
Accounts payable and other current liabilities     (1,030)
Fair value of assets acquired     9,688
Total purchase price     9,688
Less seller obligations     600
Cash paid     9,088
Eastern Contractor Services [Member]      
Business Acquisition [Line Items]      
Cash     165
Accounts receivable     2,768
Inventories     335
Other current assets     109
Property and equipment     1,364
Intangibles     13,871
Goodwill     9,904
Other non-current assets     322
Accounts payable and other current liabilities     (1,681)
Long-term debt     (82)
Other long-term liabilities     (1)
Fair value of assets acquired     27,074
Total purchase price     27,074
Less seller obligations     2,875
Cash paid     $ 24,199