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Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies and General Information [Line Items] |  |  |
Amount insured by FDIC | $ 250,000 |  |
Cash equivalents | 99,200,000 | $ 69,800,000 |
Impairment of long-lived assets | 0 | 0 | $ 0
Insurance cost of claims | 17,651,000 | 15,242,000 |
Advertising expenses | 3,900,000 | 3,800,000 | 3,200,000
Amortization expense related to financing costs | 1,200,000 | 1,200,000 | 1,100,000
Deferred financing costs | 8,200,000 | 6,400,000 |
Debt Related Financing Cost | 6,700,000 |  |
Write-off of debt issuance costs, included in interest expense | $ 3,725,000 | $ 1,164,000 | $ 2,113,000
Federal corporate tax rate | 21.00% | 21.00% | 35.00%
Tax benefit recognized, due to tax rate change |  | $ 800,000 | $ 3,800,000
Other Non-Current Assets [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Retainage receivables, expected to be collected | $ 500,000 |  |
Customer Relationships [Member] | Maximum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life | 15 years |  |
Customer Relationships [Member] | Minimum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life | 8 years |  |
Covenants Not-to-Compete [Member] | Maximum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life | 5 years |  |
Covenants Not-to-Compete [Member] | Minimum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life | 1 year |  |
Trademarks and Trade Names [Member] | Maximum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life | 15 years |  |
Trademarks and Trade Names [Member] | Minimum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life | 2 years |  |
Vehicles [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life, description | the shorter of lease life or five years |  |
Furniture, Fixtures and Equipment[Member] | Maximum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life | 5 years |  |
Furniture, Fixtures and Equipment[Member] | Minimum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life | 3 years |  |
Equipment [Member] | Maximum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life | 5 years |  |
Equipment [Member] | Minimum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life | 3 years |  |
Leasehold Improvements [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life, description | the shorter of lease life or five years |  |
Building [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Estimated useful life | 30 years |  |
Revenue [Member] | Customer Concentration Risk [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Customer concentration risk, percentage | 100.00% | 100.00% |
Revenue [Member] | Customer Concentration Risk [Member] | Maximum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Customer concentration risk, percentage | 4.00% | 4.00% | 4.00%
Accounts Receivable [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Retainage receivables | $ 33,400,000 | $ 28,000,000.0 |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Maximum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Customer concentration risk, percentage | 3.00% | 3.00% | 3.00%
Workers' Compensation Insurance [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Insurance cost of claims | $ 800,000 | $ 800,000 |
General Liability Insurance Program [Member] | Maximum [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Insurance cost of claims | 2,000,000.0 | 2,000,000.0 |
Aggregate cap of insurance cost of claims | 8,000,000.0 | 8,000,000.0 |
Vehicles Insurance [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Insurance cost of claims | 1,000,000.0 | 1,000,000.0 |
Senior Secured Credit Agreement [Member] |  |  |
Accounting Policies and General Information [Line Items] |  |  |
Deferred financing costs | 400,000 | $ 1,100,000 | $ 1,000,000.0
Write-off of debt issuance costs, included in interest expense | $ 3,300,000 |  |

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