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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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Debt Related Financing Cost.

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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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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Amount of amortization expense attributable to debt issuance costs.

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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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of right to consideration in exchange for good or service transferred to customer withheld under retainage provision in long-term contract or program when right to consideration is unconditional.

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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 finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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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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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 (Detail) - USD ($)	12 Months Ended
Significant Accounting Policies (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies and General Information [Line Items]
Customer relationships, net	$ 171,393,000	$ 153,562,000
Amount insured by FDIC	250,000
Impairment of long-lived assets	0	0	$ 0
Insurance cost of claims	19,689,000	17,651,000
Advertising expenses	3,900,000	3,900,000	3,800,000
Deferred financing costs	7,000,000.0	8,200,000
Amortization expense related to financing costs	1,300,000	1,200,000	1,200,000
Write-off of debt issuance costs, included in interest expense	0	3,725,000	1,164,000
Costs incurred associated with debt-related financing transactions	200,000
Senior Secured Credit Agreement
Accounting Policies and General Information [Line Items]
Deferred financing costs		400,000	$ 1,100,000
Write-off of debt issuance costs, included in interest expense		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	$ 1,000,000.0
Buildings
Accounting Policies and General Information [Line Items]
Estimated useful life	30 years
Maximum \| General Liability Insurance Program
Accounting Policies and General Information [Line Items]
Insurance cost of claims	$ 2,000,000.0
Aggregate cap of insurance cost of claims	$ 8,000,000.0
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 \| 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	$ 300,000
Accounts Receivable
Accounting Policies and General Information [Line Items]
Accounts receivable	$ 41,700,000	$ 33,400,000
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
Accounting Policies and General Information [Line Items]
Customer relationships, net	$ 108,504,000	$ 99,946,000
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
Accounting Policies and General Information [Line Items]
Customer relationships, net	$ 6,873,000	6,342,000
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
Accounting Policies and General Information [Line Items]
Customer relationships, net	$ 52,412,000	47,109,000
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
Adjustment \| Customer relationships
Accounting Policies and General Information [Line Items]
Customer relationships, net		$ 99,946,000