Store Count - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012 Store	Dec. 31, 2011 Store	Dec. 31, 2010 Store
Franchisor Disclosure [Line Items]
Number of stores acquired	22	52	14
Sales and Lease Ownership
Franchisor Disclosure [Line Items]
Number of stores acquired	44	38	30
Sales and Lease Ownership | Franchise
Franchisor Disclosure [Line Items]
Number of stores acquired	21	7	12
Sales and Lease Ownership | Series of Individually Immaterial Business Acquisitions
Franchisor Disclosure [Line Items]
Number of stores acquired	21	8	14
HomeSmart
Franchisor Disclosure [Line Items]
Number of stores acquired	4	47
HomeSmart | Series of Individually Immaterial Business Acquisitions
Franchisor Disclosure [Line Items]
Number of stores acquired	1	44