Nature of Business - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2016 Location Office
Nature Of Business And Significant Accounting Policies [Line Items]
Number of locations	338
Number of offices opened | Office	7
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	8
New Mexico [Member]
Nature Of Business And Significant Accounting Policies [Line Items]
Number of locations	18
North Carolina [Member]
Nature Of Business And Significant Accounting Policies [Line Items]
Number of locations	36
Oklahoma [Member]
Nature Of Business And Significant Accounting Policies [Line Items]
Number of locations	28
South Carolina [Member]
Nature Of Business And Significant Accounting Policies [Line Items]
Number of locations	72
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	98
Virginia [Member]
Nature Of Business And Significant Accounting Policies [Line Items]
Number of locations	8