Equity Investments in Unconsolidated Subsidiaries - Additional Information (Detail) (CT Opportunity Partners I, LP [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jan. 31, 2011
CT Opportunity Partners I, LP [Member]
Investments in Equity Accounted Investees [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	$ 24.6
Maximum exposure to loss from equity investment	$ 1.4
Percentage of incentive management fee pool for employees		45.00%
Percentage of granted incentive compensation to employees	96.00%
Percentage of grants vesting schedule	96.00%
Percentage of grants vesting upon receipt of dividends	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. The remaining 4% of these grants vest solely upon our receipt of incentive management fees from CTOPI or the disposition of certain investments owned by CTOPI.