Goodwill and Other Intangible Assets - Summary of Gross Amounts and Accumulated Amortization of Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 24,925	$ 11,325
Accumulated Amortization	9,964	8,382
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	19,000	7,700
Accumulated Amortization	6,086	4,795
Covenants not-to-Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	4,425	3,625
Accumulated Amortization	3,786	$ 3,587
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	1,500
Accumulated Amortization	$ 92