Summary of Acquisitions of Lease Contracts, Merchandise and Related Assets of Sales and Lease Ownership Stores (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Items]
Weighted average amortization period of intangible assets	3 years 1 month 6 days	2 years 7 months 6 days	3 years 6 months
Customer relationship intangibles
Business Acquisition [Line Items]
Weighted average amortization period of intangible assets	2 years	2 years	2 years
Non-compete intangibles
Business Acquisition [Line Items]
Weighted average amortization period of intangible assets	3 years	3 years	3 years
Minimum | Acquired franchise development rights
Business Acquisition [Line Items]
Weighted average amortization period of intangible assets	6 years	6 years	6 years
Maximum | Acquired franchise development rights
Business Acquisition [Line Items]
Weighted average amortization period of intangible assets	6 years 10 months 24 days	6 years 10 months 24 days	6 years 10 months 24 days