Equity Investments in Unconsolidated Subsidiaries - Activity Relating to Our Equity Investments in Unconsolidated Subsidiaries (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Beginning Balance		$ 22,480
Ending Balance	10,604	22,480
CTOPI Carried Interest [Member]
Schedule of Equity Method Investments [Line Items]
Beginning Balance	22,480
Distributions	(17,867)
Deferred income allocation	5,991
Ending Balance	$ 10,604