Significant Accounting Policies - Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2014
Building [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	39 years
Capital Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Capital Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	20 years
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Tenant Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	Term of the related lease (or estimated useful life, if shorter)