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Basis of Presentation and Accounting Policies - Additional Information (Detail)
6 Months Ended
Jun. 30, 2013
Basis Of Presentation [Line Items]  
Number of branches operated 56
Minimum [Member]
 
Basis Of Presentation [Line Items]  
Intangible assets amortized over an estimated useful life 3 years
Maximum [Member]
 
Basis Of Presentation [Line Items]  
Intangible assets amortized over an estimated useful life 10 years