Goodwill and Other Intangible Assets - Schedule of Carrying Value and Accumulated Amortization of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,366	$ 4,616
Accumulated Amortization	1,962	1,641
Customer list
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,993	3,993
Accumulated Amortization	1,719	1,389
Non-Compete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	103	353
Accumulated Amortization	72	87
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	270	270
Accumulated Amortization	$ 171	$ 165