Quarterly report pursuant to Section 13 or 15(d)

Real Estate Held for Sale and Impairment Charges - Additional Information (Detail)

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Real Estate Held for Sale and Impairment Charges - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Property
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Property
Sep. 30, 2014
USD ($)
Real Estate [Abstract]        
Number of real estate properties, held for sale | Property 5   5  
Impairment loss $ 622 $ 280 $ 622 $ 14,238