Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Goodwill And Intangible Assets [Line Items]
Impairment charges			$ 0		$ 0
Amortization of intangible assets	$ 4,940,000	$ 5,389,000	9,880,000	$ 10,777,000
Favorable And Unfavorable Leases [Member]
Goodwill And Intangible Assets [Line Items]
Amortization of intangible assets	$ 97,000	$ 119,000	$ 195,000	$ 237,000