Impairment of Long-Lived Assets - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014
Indefinite-lived Intangible Assets [Line Items]
Estimated aggregate fair value of long-lived assets impaired during current period	$ 1,801
Remaining operating period assumed for fee owned properties	20 years
Multiple of cash flows used to estimate fair value of long-lived asset	6.5	6.5