Stockholders' Equity - Summary of Stock-Based Compensation Recorded in Expense Categories (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	$ 1,218	$ 868	$ 3,165	$ 2,728
Cost of Services and Fulfillment [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	798	743	1,871	1,647
Selling and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	127	150	465	572
General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	$ 293	$ (25)	$ 829	$ 509