Significant Accounting Policies (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies and General Information [Line Items]
Amount insured by FDIC	$ 250,000
Impairment of long-lived assets	0	$ 0	$ 0
Insurance cost of claims	21,445,000	19,689,000
Advertising expenses	4,600,000	3,900,000
Deferred financing costs	11,400,000	7,000,000
Amortization expense related to financing costs	1,400,000	1,300,000	1,200,000
Write-off of debt issuance costs, included in interest expense	1,767,000	0	3,725,000
Costs incurred associated with debt-related financing transactions	7,500,000
Senior Secured Credit Agreement
Accounting Policies and General Information [Line Items]
Deferred financing costs	1,600,000	0	400,000
Write-off of debt issuance costs, included in interest expense	200,000	0	$ 3,300,000
Workers' Compensation Insurance
Accounting Policies and General Information [Line Items]
Insurance cost of claims	800,000
Vehicles Insurance
Accounting Policies and General Information [Line Items]
Insurance cost of claims	$ 1,000,000
Buildings
Accounting Policies and General Information [Line Items]
Estimated useful life	30 years
Maximum
Accounting Policies and General Information [Line Items]
Payment terms (in days)	60 days
Maximum | General Liability Insurance Program
Accounting Policies and General Information [Line Items]
Insurance cost of claims	$ 5,000,000
Aggregate cap of insurance cost of claims	$ 10,000,000
Maximum | Vehicles
Accounting Policies and General Information [Line Items]
Estimated useful life	5 years
Maximum | Leasehold improvements
Accounting Policies and General Information [Line Items]
Estimated useful life	5 years
Maximum | Furniture, fixtures and equipment
Accounting Policies and General Information [Line Items]
Estimated useful life	5 years
Minimum
Accounting Policies and General Information [Line Items]
Payment terms (in days)	30 days
Minimum | Furniture, fixtures and equipment
Accounting Policies and General Information [Line Items]
Estimated useful life	3 years
Other non-current assets
Accounting Policies and General Information [Line Items]
Retainage receivables	$ 500,000
Accounts Receivable
Accounting Policies and General Information [Line Items]
Accounts receivable	$ 40,500,000	$ 41,700,000
Accounts Receivable | Customer Concentration Risk | Maximum
Accounting Policies and General Information [Line Items]
Customer concentration risk, percentage	3.00%	3.00%	3.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Accounting Policies and General Information [Line Items]
Customer concentration risk, percentage	100.00%	100.00%	100.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Maximum
Accounting Policies and General Information [Line Items]
Customer concentration risk, percentage	5.00%	5.00%	5.00%
Customer relationships | Maximum
Accounting Policies and General Information [Line Items]
Estimated useful life	15 years
Customer relationships | Minimum
Accounting Policies and General Information [Line Items]
Estimated useful life	8 years
Covenants not-to-compete | Maximum
Accounting Policies and General Information [Line Items]
Estimated useful life	5 years
Covenants not-to-compete | Minimum
Accounting Policies and General Information [Line Items]
Estimated useful life	1 year
Trademarks and tradenames | Maximum
Accounting Policies and General Information [Line Items]
Estimated useful life	15 years
Trademarks and tradenames | Minimum
Accounting Policies and General Information [Line Items]
Estimated useful life	2 years
Backlog | Maximum
Accounting Policies and General Information [Line Items]
Estimated useful life	36 months
Backlog | Minimum
Accounting Policies and General Information [Line Items]
Estimated useful life	18 months