Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended
	Aug. 29, 2012 Property	Nov. 21, 2012 Location Property
Impaired Long-Lived Assets Held and Used [Line Items]
Number of locations anticipate selling with in eighteen months		3
Number of locations leased with terms expiring in January 2013 and May 2018		2
Carrying value of the owned properties	$ 4,800,000	$ 4,800,000
Properties classified as discontinued operations	7	7
Ground leases impaired	0	0
Property held for sale	$ 600,000	$ 600,000
Number of properties held for sale	1	1
Discontinued operations
Impaired Long-Lived Assets Held and Used [Line Items]
Number of locations		24
Sold
Impaired Long-Lived Assets Held and Used [Line Items]
Number of locations		15
Terminated
Impaired Long-Lived Assets Held and Used [Line Items]
Number of locations		2
Continuing Operations
Impaired Long-Lived Assets Held and Used [Line Items]
Number of locations		2
Minimum
Impaired Long-Lived Assets Held and Used [Line Items]
Asset disposal period		1 year
Maximum
Impaired Long-Lived Assets Held and Used [Line Items]
Asset disposal period		3 years
Newer properties | Minimum
Impaired Long-Lived Assets Held and Used [Line Items]
Time span of future cash flow		20 years
Newer properties | Maximum
Impaired Long-Lived Assets Held and Used [Line Items]
Time span of future cash flow		25 years
Older properties | Minimum
Impaired Long-Lived Assets Held and Used [Line Items]
Time span of future cash flow		5 years
Older properties | Maximum
Impaired Long-Lived Assets Held and Used [Line Items]
Time span of future cash flow		10 years