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Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Other Intangible Assets [Line Items]    
Amortized intangible assets, Gross Carrying Value $ 6,580 $ 4,553
Intangible asset, Gross Carrying Value 7,040 5,013
Accumulated Amortization (2,130) (2,492)
Amortized intangible assets, Net Carrying Value 460 2,061
Other intangible assets, net 4,910 2,521
Contracts and Customer Relationships [Member]
    
Other Intangible Assets [Line Items]    
Amortized intangible assets, Gross Carrying Value 5,428 3,594
Accumulated Amortization (1,960) (2,384)
Amortized intangible assets, Net Carrying Value 3,468 1,210
Other [Member]
    
Other Intangible Assets [Line Items]    
Amortized intangible assets, Gross Carrying Value 1,152 959
Accumulated Amortization (170) (108)
Amortized intangible assets, Net Carrying Value 982 851
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