Income Taxes - Schedule of Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating loss carry-forwards	$ 1,575,952	$ 648,652
Research and development credits	306,808	208,499
Other tax credits	117,997	106,530
Deferred revenue	200,531	268,434
Inventory and warranty reserves	74,578	95,570
Stock-based compensation	96,916	120,955
Financial Instruments	3,080
Investment in certain financing funds	24,471	237,759
Accruals and others	23,336	67,769
Total deferred tax assets	2,423,669	1,754,168
Valuation allowance	(1,843,713)	(1,022,705)
Deferred tax assets, net of valuation allowance	579,956	731,463
Deferred tax liabilities:
Depreciation and amortization	(537,613)	(679,969)
Other	(18,734)	(3,779)
Financial Instruments		(22,033)
Total deferred tax liabilities	(556,347)	(705,781)
Deferred tax assets, net of valuation allowance and deferred tax liabilities	$ 23,609	$ 25,682