Impairment of Long-Lived Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Indefinite-lived Intangible Assets [Line Items]
Lease period of fee owned properties	20 years
Fair value of long-lived assets in the multiples of cash flow	Six and a half times	Six and a half times
Estimated aggregate fair value of long-lived assets impaired during current period	$ 2,071