Organization, Business and Summary of Significant Accounting Policies - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Revenues	$ 72,301	$ 78,169	$ 214,953	$ 231,527
eDiscovery Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	48,021	52,910	147,056	161,075
Managed Review [Member]
Disaggregation Of Revenue [Line Items]
Revenues	14,015	14,025	36,847	35,944
Legal Technology Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	62,036	66,935	183,903	197,019
Data Recovery [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 10,265	$ 11,234	$ 31,050	$ 34,508