Goodwill and Intangible Assets - Summary of Goodwill and Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Goodwill And Intangible Assets [Line Items]
Gross carrying amount	$ 212,313	$ 216,329
Accumulated amortization	(129,950)	(128,299)
Net carrying Amount	82,363	88,030
Total intangible assets, Gross carrying amount	358,613	362,629
Total intangible assets, Net carrying Amount	228,663	234,330
Goodwill, gross carrying amount	199,513	199,513
Goodwill, Accumulated amortization	0	0
Goodwill, net carrying amount	199,513	199,513
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	11 years
Gross carrying amount	$ 173,063	$ 173,063
Accumulated amortization	(102,647)	(99,439)
Net carrying Amount	$ 70,416	$ 73,624
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)		8 years
Gross carrying amount		$ 4,017
Accumulated amortization		(2,345)
Net carrying Amount		$ 1,672
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)	7 years	7 years
Gross carrying amount	$ 21,350	$ 21,349
Accumulated amortization	(9,403)	(8,615)
Net carrying Amount	$ 11,947	$ 12,734