Intangible Assets and Goodwill - Additional Information (Details) - USD ($)			1 Months Ended	12 Months Ended
	Feb. 02, 2017	Oct. 14, 2015	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Investment capacity under Clinton's management	$ 1,000,000,000
Stock issued (in shares)	1,250,000
Fair value of stock issued	$ 10,100,000			$ 10,200,000
Intangible assets impairment			$ 2,700,000	2,700,000	$ 0
Goodwill			$ 0	0	3,800,000	$ 3,800,000
Goodwill impairment loss				$ 3,800,000	0
Connected Data, Inc.
Acquired Finite-Lived Intangible Assets [Line Items]
Percentage of stock owned in acquired entity		100.00%
Consideration transferred		$ 6,700,000
Intangible assets acquired		4,300,000
Goodwill		$ 3,800,000			$ 3,800,000
Service Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets useful life (in years)	5 years