Restructuring and Other Expense - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Earnest money payment relating to asset sale	$ 1,400,000
Property tax refund		$ 2,200,000
Other employee costs and consulting fees	(100,000)	4,000,000
Restructuring reserve	300,000	0
Realization Services, Inc. | Affiliated Entity | Consulting Expenses with Realization Services
Restructuring Cost and Reserve [Line Items]
Expenses from transactions with related party	600,000	2,400,000
Otterbourg P.C. | Affiliated Entity | Consulting Expenses with Realization Services
Restructuring Cost and Reserve [Line Items]
Expenses from transactions with related party		1,400,000
Contingent Consideration Obligations | Connected Data, Inc.
Restructuring Cost and Reserve [Line Items]
Reversal of cost	300,000
Other Employee Costs
Restructuring Cost and Reserve [Line Items]
Reversal of cost	$ 400,000
Other employee costs and consulting fees		$ 2,400,000