Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Net operating loss carryforwards	$ 182,599	$ 199,635
Accrued compensation	12,519	1,151
Deferred revenue	3,845	2,738
Tax credit carryforwards	10,797	10,370
Stock-based compensation	8,416	6,800
Basis difference in discontinued E-Commerce business	33,871	0
Other, net	6,720	5,471
Total gross deferred tax assets	258,767	226,165
Valuation allowance	(217,452)	(211,865)	$ (235,730)
Deferred tax assets, net of valuation allowance	41,315	14,300
Deferred tax liabilities:
Depreciation and amortization	(140,035)	(28,815)
Discount on Notes	(4,422)	(5,767)
Other, net	(378)	0
Total gross deferred tax liabilities	(144,835)	(34,582)
Net deferred tax liabilities	$ (103,520)	$ (20,282)