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Nature of Business and Significant Accounting Policies - Additional Information (Detail)
 6 Months Ended
Jun. 30, 2013
Office
Location
Nature Of Business And Significant Accounting Policies [Line Items]  
Number of locations 263
Number of offices opened 42
Alabama [Member]
  
Nature Of Business And Significant Accounting Policies [Line Items]  
Number of locations 49
Georgia [Member]
  
Nature Of Business And Significant Accounting Policies [Line Items]  
Number of locations 3
New Mexico [Member]
  
Nature Of Business And Significant Accounting Policies [Line Items]  
Number of locations 4
North Carolina [Member]
  
Nature Of Business And Significant Accounting Policies [Line Items]  
Number of locations 29
Oklahoma [Member]
  
Nature Of Business And Significant Accounting Policies [Line Items]  
Number of locations 21
South Carolina [Member]
  
Nature Of Business And Significant Accounting Policies [Line Items]  
Number of locations 70
Tennessee [Member]
  
Nature Of Business And Significant Accounting Policies [Line Items]  
Number of locations 21
Texas [Member]
  
Nature Of Business And Significant Accounting Policies [Line Items]  
Number of locations 66