Income Taxes - Reconciliation of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 734,755	$ 610,314
Credit carryforwards	171,856	120,594
Lease liability	108,224
Depreciation and amortization	577,599	594,496
Other	96,535	103,917
Total deferred tax assets	1,688,969	1,429,321
Less valuation allowance	(918,596)	(1,342,981)
Deferred tax assets net	770,373	86,340
Deferred tax liabilities:
Right of use asset	(101,091)
Other	(73,818)	(67,686)
Net deferred tax assets	$ 595,464	$ 18,654