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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Total allocated share-based compensation expense $ 7,976 $ 8,347 $ 7,444
Cost of Services and Fulfillment [Member]      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Total allocated share-based compensation expense 4,431 4,573 4,316
Selling and Marketing [Member]      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Total allocated share-based compensation expense 1,054 1,152 1,132
General and Administrative [Member]      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Total allocated share-based compensation expense $ 2,491 $ 2,622 $ 1,996