Equity Investments - Separate Financial Statements for Unconsolidated Subsidiaries (Detail)	12 Months Ended
	Dec. 31, 2014
CDH CDO LLC [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Determined significant years	2013
Vintage Housing Holdings [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Determined significant years	2013
701 Seventh WRT Investor LLC [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Determined significant years	2013