Subsequent Events - Unconsummated Sale of Cole Capital to RCS (Details) (Sale Agreement Termination [Member], Subsequent Event [Member], USD $) (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Dec. 15, 2014	Dec. 04, 2014	Sep. 30, 2014
Executive [Member]
Subsequent Event [Line Items]
Relinquished shares	2.7
Sale Agreement Termination Member
Subsequent Event [Line Items]
Sale of business, expected consideration, contingent consideration			$ 130.0
Litigation settlement, amount		60.0
Litigation settlement, amount, cash		42.7
Litigation settlement, amount, unsecured notes payable		15.3
Litigation settlement, amount, release of liability		2.0
Litigation settlement, unsecured notes payable, interest rate, stated percentage		8.00%
Sale Agreement Termination Member | Subsidiary of Common Parent [Member]
Subsequent Event [Line Items]
Sale of business, consideration			700.0
Litigation settlement, amount, cash		$ 10.0