Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014
Real Estate and Accumulated Depreciation [Line Items]
Tenant Improvements	Shorter of Lease Term or Useful Life
Buildings and Improvements | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Property, Plant and Equipment Useful Life	7 years
Buildings and Improvements | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Property, Plant and Equipment Useful Life	50 years
Land Improvements | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Property, Plant and Equipment Useful Life	3 years
Land Improvements | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Property, Plant and Equipment Useful Life	20 years