Stockholders' Equity - Summary of Stock-Based Compensation Recorded in Expense Categories (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total allocated share-based compensation expense	$ 1,983	$ 1,860	$ 5,148	$ 4,588
Cost of Services and Fulfillment [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total allocated share-based compensation expense	1,134	1,061	3,005	2,708
Selling and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total allocated share-based compensation expense	302	321	767	893
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total allocated share-based compensation expense	$ 547	$ 478	$ 1,376	$ 987