Equity Investments in Unconsolidated Joint Ventures - Investments in Unconsolidated Joint Ventures (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Total Assets	$ 394,927		$ 417,842
Ramco 450 Venture LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest	20.00%
Total Assets	281,463		283,100
Ramco/Lion Venture LP
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest	30.00%
Total Assets	68,526		89,091
Other Joint Ventures
Schedule of Equity Method Investments [Line Items]
Total Assets	$ 44,938	[1]	$ 45,651	[1]

[1] Includes two joint ventures in which we have a 7% ownership interest. Each joint venture owns one property.