Other Noncontrolling Interests - Additional Information (Detail) (USD $)	1 Months Ended
	Nov. 30, 2013 Store	May 31, 2013 Store	Feb. 28, 2013 Store	Dec. 31, 2014 Store
Noncontrolling Interest in Operating Partnership [Line Items]
Number of stores under construction				1
Number of operating stores owned by consolidated joint venture				19
Purchase of capital interest by entity in a joint venture partner of a consolidated property	10.00%	27.60%	1.70%
Cash paid for acquiring interest in a joint venture partner of a consolidated property	$ 1,292,000	$ 950,000	$ 200,000
Number of joint venture partners in a consolidated store in which ownership interest was acquired	1	1	1
Carrying amount of noncontrolling interest	$ 0	$ 0
Purchase of profit interest by the entity in a joint venture partner of a consolidated property		35.00%	17.00%
Ownership interest held by entity in joint venture partner of a consolidated stores prior to acquisition			95.00%
Ownership interest held by entity in joint venture partner of a consolidated stores			96.70%
Other [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Number of consolidated joint ventures				2
Other [Member] | Minimum [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Ownership interests of third party owners				1.00%
Other [Member] | Maximum [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Ownership interests of third party owners				3.30%