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Aggregate cap carrying value of obligations and payables pertaining to claims incurred of a workers compensation nature.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act.

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Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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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