Transactions with Related Parties - Additional Information (Detail) (USD $)	0 Months Ended		1 Months Ended	12 Months Ended					0 Months Ended	12 Months Ended	0 Months Ended		1 Months Ended	12 Months Ended					12 Months Ended
	Oct. 02, 2013	May 13, 2013	Oct. 23, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 30, 2013	May 31, 2013 Class A Common Stock [Member]	Oct. 03, 2013 Manager [Member]	Dec. 31, 2013 Manager [Member]	Dec. 20, 2012 Sale to Holdings III [Member]	May 13, 2013 Blackstone [Member]	Oct. 23, 2013 Affiliate of Manager [Member]	Dec. 31, 2013 Affiliate of Manager [Member]	Nov. 19, 2013 Affiliate of Manager [Member]	May 13, 2013 Affiliate of Manager [Member]	May 22, 2013 Affiliate of Manager [Member] Class A Common Stock [Member]	Feb. 11, 2014 Affiliate of Manager [Member] Subsequent Event [Member] Class A Common Stock [Member]	Dec. 31, 2013 Affiliate of our Manager [Member]	Dec. 31, 2013 Affiliate of our Manager [Member] CT CDO I [Member]	Dec. 31, 2013 W.R. Berkley Corporation [Member]	Feb. 11, 2014 W.R. Berkley Corporation [Member] Subsequent Event [Member]
Related Party Transaction [Line Items]
Class A common shares acquired by Holdings III, price per share											$ 20.00
Class A common shares acquired by Holdings III, shares				25,875,000	669,047						500,000
Accrued management fees payable														$ 2,500,000
Management fees paid to Manager														3,400,000
Preferred distributions payable to affiliate of our Manager																			193,000
Payments of preferred distributions to affiliate of our Manager																			3,900,000
Issuance of restricted class A common stock				700,000	36,493	26,161			339,431
Common stock value				288,000	293,000				8,500,000								1,000,000
Vesting period of restricted class A common stock									3 years
Non-cash expense										767,000
Special servicing fees																				847,000
Joint venture agreement date		May 13, 2013
Percentage of equity interest purchased		100.00%					100.00%					16.70%				83.30%
Joint venture agreement end date		May 30, 2013
Charge to non-controlling interest from purchase of equity interests at fair value		193,000
Common stock, shares issued				28,802,000	2,927,000			25,875,000									1,960,784
Common stock, par value				$ 0.01	$ 0.01												$ 25.50
Common stock, shares outstanding percentage																		7.10%
Convertible notes				159,524,000											188,000
Amount of loan originated	71,000,000			2,327,913,000
Purchased loan from third-party			176,900,000
Modification fee													2,300,000
Aggregate amount of offering as stated in letter agreement, threshold																					$ 30,000,000
Beneficially owned common stock and stock units (as a percent)																						1.00%