Equity Investments in Unconsolidated Joint Ventures - Investments in Unconsolidated Joint Ventures (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Total Assets	$ 415,855	$ 437,680
Ramco/Lion Venture LP
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest	30.00%
Total Assets	89,204	91,053
Ramco 450 Venture LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest	20.00%
Total Assets	280,755	293,410
Other Joint Ventures
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest	7.00%
Total Assets	$ 45,896	$ 53,217