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Summary of Significant Accounting Policies - Summary of Stock-Based Compensation Expense Recorded in Expense Categories (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Total allocated share-based compensation expense $ 8,300 $ 8,490 $ 7,976
Cost of Services and Fulfillment [Member]      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Total allocated share-based compensation expense 4,329 4,538 4,431
Selling and Marketing [Member]      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Total allocated share-based compensation expense 1,065 717 1,054
General and Administrative [Member]      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Total allocated share-based compensation expense $ 2,906 $ 3,235 $ 2,491