Goodwill and Intangible Assets - Summary of the Identifiable Intangible Assets Subject for Amortization (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 27,977	$ 27,977
Impairment Charges	0	0
Accumulated Amortization	19,599	15,987
Net Carrying Amount	8,378	11,990
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,860	3,860
Impairment Charges	0	0
Accumulated Amortization	3,860	3,860
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,978	22,978
Impairment Charges	0	0
Accumulated Amortization	14,611	11,187
Net Carrying Amount	8,367	11,791
Capitalized Product Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,139	1,139
Impairment Charges	0	0
Accumulated Amortization	1,128	940
Net Carrying Amount	$ 11	$ 199