Other Expenses - Schedule of General and Administrative Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Professional services	$ 3,156	$ 2,324	$ 1,889
Operating and other costs	2,709	1,980	1,762
Subtotal	15,488	4,304	3,651
Non-cash and CT Legacy Portfolio compensation expenses
Restricted class A common stock earned	12,966	7,988	1,064
Subtotal	20,888	22,635	6,416
General and administrative expenses	36,709	27,799	11,505
General and Administrative Expense [Member]
Non-cash and CT Legacy Portfolio compensation expenses
Director stock-based compensation	375	375	263
CT Legacy Partners [Member]
Non-cash and CT Legacy Portfolio compensation expenses
Management incentive awards plan	2,177	1,374	5,089
Blackstone [Member]
Non-cash and CT Legacy Portfolio compensation expenses
General and administrative expenses	36,376	26,939	10,067
REIT [Member]
Non-cash and CT Legacy Portfolio compensation expenses
General and administrative expenses	333	860	$ 1,438
General Electrical Capital Corporation [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
GE transaction costs	9,623
CT Opportunity Partners I, LP [Member]
Non-cash and CT Legacy Portfolio compensation expenses
Management incentive awards plan	$ 5,370	$ 12,898