Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts Deducted from Accounts Receivable in the Balance Sheet
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 15	$ 115
Additions Charged to Costs and Expenses	45	220
Deductions from Allowance	(26)	(320)
Balance at End of Period	34	15
Allowance for Deferred Tax Assets Not Expected to be Realized
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	30,746	19,813
Additions Charged to Costs and Expenses	(4,304)	16,624
Deductions from Allowance	(2,728)	(5,691)
Balance at End of Period	23,714	30,746
Allowance for Estimated Fair Value of Bail Bonds Industry Solutions Segment's Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	744	0
Additions Charged to Costs and Expenses	0	744
Deductions from Allowance	(744)	0
Balance at End of Period	0	744
Allowance for Unamortized Debt Discount and Debt Issuance Costs
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1,194	0
Additions Charged to Costs and Expenses	912	1,990
Deductions from Allowance	(1,342)	(796)
Balance at End of Period	$ 764	$ 1,194