Equity Investments in Unconsolidated Subsidiaries - Activity Relating to Our Equity Investments in Unconsolidated Subsidiaries (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Beginning Balance		$ 10,604
Ending Balance	11,570	10,604
CTOPI Carried Interest [Member]
Schedule of Equity Method Investments [Line Items]
Beginning Balance	10,604
Deferred income allocation	966
Ending Balance	$ 11,570