Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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	11,647,000	10,395,000
Advertising expenses	3,000,000	2,300,000	1,600,000
Amortization expense related to financing costs	400,000	300,000	200,000
Deferred debt issuance costs, net of accumulated amortization	1,700,000	1,100,000
Write-off of debt issuance costs, included in interest expense	$ 286,000		$ 233,000
Maximum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life	6 years
Minimum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life	4 years
ASU 2015-03 [Member]
Accounting Policies and General Information [Line Items]
Deferred debt issuance costs, net of accumulated amortization	$ 1,200,000	$ 600,000
Debt issuance costs	$ 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	8 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%	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] | 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	2,000,000
Aggregate cap of insurance cost of claims	8,000,000	8,000,000
Self-incurred retention	350,000	$ 350,000
Credit and Security Agreement [Member]
Accounting Policies and General Information [Line Items]
Deferred debt issuance costs, net of accumulated amortization	$ 300,000