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Nature of Business - Additional Information (Detail)	Dec. 31, 2016 Branches Location	Dec. 31, 2015 Branches	Dec. 31, 2014 Branches
Nature of Business [Line Items]
Number of branches	339
Number of branches opened | Branches	8	31	36
Alabama [Member]
Nature of Business [Line Items]
Number of branches	49
Georgia [Member]
Nature of Business [Line Items]
Number of branches	8
New Mexico [Member]
Nature of Business [Line Items]
Number of branches	19
North Carolina [Member]
Nature of Business [Line Items]
Number of branches	36
Oklahoma [Member]
Nature of Business [Line Items]
Number of branches	28
South Carolina [Member]
Nature of Business [Line Items]
Number of branches	72
Tennessee [Member]
Nature of Business [Line Items]
Number of branches	21
Texas [Member]
Nature of Business [Line Items]
Number of branches	98
Virginia [Member]
Nature of Business [Line Items]
Number of branches	8

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Represents the number of stores.

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