Equity Investments in Unconsolidated Subsidiaries - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 CT Opportunity Partners I, LP [Member]	Jan. 31, 2011 CT Opportunity Partners I, LP [Member]	Dec. 31, 2013 CT Opportunity Partners I, LP [Member] Acceleration Event [Member]	Dec. 31, 2013 CT Opportunity Partners I, LP [Member] Incentive Management Fees [Member]
Schedule of Equity Method Investments [Line Items]
Carried interest			100.00%
Incentive compensation, percentage of funds profit			17.70%
Preferred return			9.00%
Return of capital to partners			100.00%
Incentive compensation			$ 32.6
Advance distribution of incentive compensation	8.8	1.4
Book value of net investment in CTOPI carried interest	(10.2)
Maximum exposure to loss from equity investment			$ 10.2
Percentage of incentive management fee pool for employees				45.00%
Percentage of granted incentive compensation to employees			96.00%
Percentage of grants vesting schedule			65.00%
Percentage of grants vesting upon receipt of dividends			35.00%		31.00%	4.00%
Description of incentive management fee grants to employees vesting schedule			(i) one-third on the date of grant; (ii) one-third on September 13, 2012; and (iii) the remainder vests upon our receipt of incentive management fees from CTOPI. Of the remaining 35% of these grants, 31% are fully vested as a result of an acceleration event, and 4% vest solely upon our receipt of incentive management fees from CTOPI or the disposition of certain investments owned by CTOPI.