Fair Values - Assets Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) (CT CDO I [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2014
CT CDO I [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan loss reserve held by CT CDO I/securitization vehicles	100.00%
Impaired loan, principal balance	$ 10.5	$ 10.5