Equity Investments - Separate Financial Statements for Unconsolidated Subsidiaries (Detail)	12 Months Ended
	Dec. 31, 2013
Concord Debt Holdings LLC [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Determined significant years	2011
CDH CDO LLC [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Determined significant years	2013
Northwest Atlanta Partners LP [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Determined significant years	2011
Sealy Newmarket General Partnership [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Determined significant years	2011