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Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 26, 2017 | May 01, 2017 | Mar. 20, 2017 | Jan. 05, 2017 | Apr. 12, 2016 | Feb. 29, 2016 | Feb. 02, 2016 | Jan. 25, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired expected to be tax deductible |  |  |  |  |  |  |  |  | $ 40,000 |  | $ 40,000 |
Revenue |  |  |  |  |  |  |  |  | 282,196 | $ 211,913 | 537,865 | $ 403,611
Net income (loss) |  |  |  |  |  |  |  |  | 11,973 | 9,993 | 18,337 | 15,806
Seller obligations in connection with acquisition of businesses |  |  |  |  |  |  |  |  |  |  | 3,025 | 2,430
Amortization of intangibles |  |  |  |  |  |  |  |  | 6,550 | 2,810 | 12,966 | 5,289
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 5,998 | 4,960 | 9,781 | 8,069
Interest expense |  |  |  |  |  |  |  |  | 4,865 | 1,509 | 7,035 | 3,061
Administrative [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs |  |  |  |  |  |  |  |  | 700 | 400 | 1,300 | $ 800
Alpha [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid for acquisition |  |  |  | $ 103,800 |  |  |  |  |  |  | 103,810 |
Business combination contingencies amount recognized |  |  |  | 21,700 |  |  |  |  |  |  |  |
Purchase consideration, value of shares issued |  |  |  | $ 10,900 |  |  |  |  |  |  |  |
Purchase consideration, number of shares issued |  |  |  | 282,577 |  |  |  |  |  |  |  |
Seller obligations |  |  |  | $ 2,000 |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 30,300 |  | 58,500 |
Net income (loss) |  |  |  |  |  |  |  |  | 200 |  | 500 |
Seller obligations in connection with acquisition of businesses |  |  |  |  |  |  |  |  |  |  | 2,002 |
Common stock issued upon acquisition |  |  |  |  |  |  |  |  |  |  |  | 282,577
Key Insulation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid for acquisition |  |  |  |  |  |  |  | $ 5,000 |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 2,200 | 4,300 |
Net income (loss) |  |  |  |  |  |  |  |  |  | (100) | (200) |
Seller obligations in connection with acquisition of businesses |  |  |  |  |  |  |  | $ 700 |  |  |  |
Marshall Insulation LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid for acquisition |  |  |  |  |  |  | $ 900 |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 900 |  | $ 1,500
Net income (loss) |  |  |  |  |  |  |  |  |  | (76) |  | (200)
Seller obligations in connection with acquisition of businesses |  |  |  |  |  |  | $ 100 |  |  |  |  |
Kern Door Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid for acquisition |  |  |  |  |  | $ 2,900 |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 700 |  | 1,000
Net income (loss) |  |  |  |  |  |  |  |  |  | 200 |  | 100
Seller obligations in connection with acquisition of businesses |  |  |  |  |  | $ 100 |  |  |  |  |  |
Combined Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid for acquisition |  |  |  |  |  |  |  |  |  |  | 117,130 | 29,948
Seller obligations in connection with acquisition of businesses |  |  |  |  |  |  |  |  |  |  | 3,025 | 2,430
Amortization of intangibles |  |  |  |  |  |  |  |  | 200 | 4,100 | 400 | 8,500
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 200 | 1,100 | 600 | 1,800
Interest expense |  |  |  |  |  |  |  |  |  | 500 |  | 900
Custom Glass Atlanta Inc and Atlanta Commercial Glazing Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid for acquisition |  |  | $ 3,400 |  |  |  |  |  |  |  |  |
Seller obligations |  |  | $ 300 |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 3,600 |  | 4,100 |
Net income (loss) |  |  |  |  |  |  |  |  | 200 |  | 300 |
Legacy Glass & Supply Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid for acquisition |  | $ 2,100 |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,100 |  | 1,100 |
Net income (loss) |  |  |  |  |  |  |  |  | 16 |  | 16 |
Seller obligations in connection with acquisition of businesses |  | $ 100 |  |  |  |  |  |  |  |  |  |
Columbia Shelving & Mirror Inc And Charleston Shelving & Mirror Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid for acquisition | $ 7,800 |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 200 |  | 200 |
Net income (loss) |  |  |  |  |  |  |  |  | $ 7 |  | $ 7 |
Seller obligations in connection with acquisition of businesses | $ 600 |  |  |  |  |  |  |  |  |  |  |
Alpine Insulation Co Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid for acquisition |  |  |  |  | $ 21,200 |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 6,800 |  | 6,800
Net income (loss) |  |  |  |  |  |  |  |  |  | $ 400 |  | $ 400
Seller obligations in connection with acquisition of businesses |  |  |  |  | $ 1,600 |  |  |  |  |  |  |

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