Goodwill and Other Intangibles Net - Summary of Changes in Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite and Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	$ 131,792	$ 97,999
Definite-lived assets, gross carrying amount	15,859	14,975
Intangible assets, gross carrying amount	147,651	112,974
Definite-lived assets, accumulated amortization	(13,041)	(10,968)
Intangible assets, accumulated amortization ending balance	(13,041)	(10,968)
Definite-lived assets, net carrying amount	2,818	4,007
Intangible assets, net carrying amount	$ 134,610	102,006
Minimum [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible asset estimated useful life	2 years
Maximum [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible asset estimated useful life	10 years
Trade Names [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	$ 78,299	64,672
Definite-lived assets, gross carrying amount	10,127	9,294
Definite-lived assets, accumulated amortization	(7,547)	(5,991)
Definite-lived assets, net carrying amount	$ 2,580	$ 3,303
Trade Names [Member] | Minimum [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible asset estimated useful life	4 months	8 months
Trade Names [Member] | Maximum [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible asset estimated useful life	10 years	9 years
Noncompete Agreements [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Definite-lived assets, gross carrying amount	$ 5,732	$ 5,681
Definite-lived assets, accumulated amortization	(5,494)	(4,977)
Definite-lived assets, net carrying amount	$ 238	$ 704
Noncompete Agreements [Member] | Minimum [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible asset estimated useful life	2 months	2 months
Noncompete Agreements [Member] | Maximum [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible asset estimated useful life	2 years	3 years
Licensing Agreements [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived assets, carrying amount	$ 53,493	$ 33,327