Annual report pursuant to Section 13 and 15(d)

Real Estate Dispositions and Impairment Charges - Additional Information (Detail)

v2.4.1.9
Real Estate Dispositions and Impairment Charges - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended
Jun. 06, 2014
Mar. 31, 2014
Dec. 31, 2014
Real Estate [Abstract]      
Proceeds from sale of real estate $ 11,400,000us-gaap_ProceedsFromSaleOfRealEstate   $ 11,162,000us-gaap_ProceedsFromSaleOfRealEstate
Property selling cost 200,000us-gaap_SellingExpense    
Gain on sale of real estate 1,200,000us-gaap_GainsLossesOnSalesOfOtherRealEstate   1,240,000us-gaap_GainsLossesOnSalesOfOtherRealEstate
Impairment loss   $ 14,000,000us-gaap_AssetImpairmentCharges $ 14,238,000us-gaap_AssetImpairmentCharges
Expiration period of property lease     2017-01
Extended period of lease on property     2 years