Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Other Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Value	$ 6,795	$ 4,553
Intangible asset, Gross Carrying Value	7,255	5,013
Accumulated Amortization	(2,474)	(2,492)
Amortized intangible assets, Net Carrying Value	4,321	2,061
Other intangible assets, net	4,781	2,521
Business Licenses [Member]
Other Intangible Assets [Line Items]
Unamortized intangible assets, Gross Carrying Value	460	460
Unamortized intangible assets, Accumulated Amortization
Unamortized intangible assets, Net Carrying Value	460	460
Contracts and Customer Relationships [Member]
Other Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Value	5,483	3,594
Accumulated Amortization	(2,238)	(2,384)
Amortized intangible assets, Net Carrying Value	3,245	1,210
Other [Member]
Other Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Value	1,312	959
Accumulated Amortization	(236)	(108)
Amortized intangible assets, Net Carrying Value	$ 1,076	$ 851