Quarterly report pursuant to Section 13 or 15(d)

Impairment of Long-Lived Assets - Additional Information (Detail)

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Impairment of Long-Lived Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 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 $ 4,297