Equity Investment in Unconsolidated Subsidiary - Additional Information (Detail) - CT Opportunity Partners I, LP [Member] - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jan. 31, 2011
Schedule of Equity Method Investments [Line Items]
Carried interest revenue, percentage of fund's profit	17.70%
Preferred return	9.00%
Return of capital to partners	100.00%
Promote income recognized		$ 138,000
Percentage of carried interest distributions pool for employees			45.00%
Description of incentive management fee grants to employees vesting schedule	During the three months ended March 31, 2016, we recognized $170,000 of expenses under the CTOPI incentive plan. Such amounts were recognized as a component of general and administrative expenses in our consolidated statements of operations.
CTOPI Incentive Plan [Member]
Schedule of Equity Method Investments [Line Items]
Recognized expenses for incentive plan		$ 170,000