Summary of Significant Accounting Policies - Useful Lives of Related Real Estate and Other Assets (Detail)	12 Months Ended
	Dec. 31, 2013
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Weighted average useful lives of related real estate and other assets	38 years 2 months 12 days
Tenant lease intangibles [Member]
Property, Plant and Equipment [Line Items]
Weighted average useful lives of related real estate and other assets	18 years 7 months 6 days
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Weighted average useful lives of related real estate and other assets	22 years 2 months 12 days
Furniture, equipment and other [Member]
Property, Plant and Equipment [Line Items]
Weighted average useful lives of related real estate and other assets	9 years 4 months 24 days