Goodwill and Intangible Assets - Summary of Goodwill and Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jan. 01, 2018
Goodwill And Intangible Assets [Line Items]
Gross carrying amount	$ 211,027	$ 201,567
Accumulated amortization	(120,235)	(112,210)
Net carrying Amount	90,792	89,357
Total intangible assets, Gross carrying amount	357,327	347,867
Total intangible assets, Net carrying Amount	237,092	235,657	$ 235,657
Goodwill, gross carrying amount	191,038	176,981
Goodwill	191,038	176,981	$ 176,981
Trade and brand names
Goodwill And Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 146,300	$ 146,300
Customer relationships
Goodwill And Intangible Assets [Line Items]
Weighted average amortization period (years)	11 years 1 month 6 days	11 years 1 month 6 days
Gross carrying amount	$ 172,932	$ 171,782
Accumulated amortization	(92,965)	(86,501)
Net carrying Amount	$ 79,967	$ 85,281
Noncompete agreements
Goodwill And Intangible Assets [Line Items]
Weighted average amortization period (years)	5 years	5 years
Gross carrying amount	$ 14,500	$ 14,500
Accumulated amortization	(14,500)	(14,500)
Net carrying Amount	$ 0	$ 0
Favorable leases
Goodwill And Intangible Assets [Line Items]
Weighted average amortization period (years)	7 years 8 months 12 days	7 years 6 months
Gross carrying amount	$ 3,455	$ 2,935
Accumulated amortization	(2,156)	(1,972)
Net carrying Amount	$ 1,299	$ 963
Order backlog
Goodwill And Intangible Assets [Line Items]
Weighted average amortization period (years)	4 months 24 days	4 months 24 days
Gross carrying amount	$ 3,400	$ 3,400
Accumulated amortization	(3,400)	(3,400)
Net carrying Amount	$ 0	$ 0
Reacquired franchise rights
Goodwill And Intangible Assets [Line Items]
Weighted average amortization period (years)	6 years 9 months 18 days	5 years 9 months 18 days
Gross carrying amount	$ 16,590	$ 8,950
Accumulated amortization	(7,199)	(5,837)
Net carrying Amount	$ 9,391	$ 3,113
Reacquired ADA rights
Goodwill And Intangible Assets [Line Items]
Weighted average amortization period (years)	5 years
Gross carrying amount	$ 150
Accumulated amortization	(15)
Net carrying Amount	$ 135