Organization, Business and Summary of Significant Accounting Policies - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Revenues	$ 64,381	$ 78,332	$ 142,652	$ 153,358
eDiscovery Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	45,402		99,035
Managed Review [Member]
Disaggregation Of Revenue [Line Items]
Revenues	9,706		22,832
Legal Technology Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	55,108		121,867
Data Recovery [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 9,273		$ 20,785