Equity Investments in Unconsolidated Joint Ventures - Additional Information (Detail) - Mar. 31, 2017	partnership_unit	investment	Total
Schedule of Equity Method Investments [Line Items]
Number of joint ventures	3	3
Joint Venture One
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)			7.00%
Joint Venture Two
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)			20.00%
Joint Venture Three
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)			30.00%