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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Client
Dec. 31, 2018
Client
Dec. 31, 2019
USD ($)
Client
Dec. 31, 2018
Client
Jun. 30, 2019
USD ($)
Client
Jul. 01, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Right of use assets | $ $ 11,151   $ 11,151   $ 0 $ 13,100
Lease liability | $ $ 14,848   $ 14,848     $ 16,700
Customer Concentration Risk [Member] | Net revenue [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of clients accounted for more than 10% of net revenue 1 1 1 1    
Concentration risk percentage accounted by major clients 18.00% 21.00% 18.00% 23.00%    
Number of other clients accounted for more than 10% of net revenue 0 0 0 0    
Customer Concentration Risk [Member] | Accounts Receivable [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of other clients accounted for more than 10% of net accounts receivable     0   0  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Client Two [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Concentration risk percentage accounted by major clients     9.00%   11.00%  
Number of clients accounted for 10% or more than 10% of net accounts receivable     1   1