Stock-based Compensation - Summary of Stock-based Compensation by Line Item (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 32,902	$ 215
Tax effect on stock-based compensation expense	0	0
Total stock-based compensation expense after income taxes	32,902	215
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	32,890	210
Sales, Marketing and Customer Service [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 12	$ 5