Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss carryforwards, or NOLs	$ 253,973	$ 209,679
Foreign tax credits	43,026	43,225
Disallowed interest deduction	40,777	16,248
Worker’s compensation and other current accruals	6,250	8,375
Deferred deductions	12,345	10,481
Deferred revenue	7,209
Operating lease liability	5,461
Other	4,367	6,380
Total deferred tax assets	373,408	294,388
Valuation allowance	(186,620)	(174,970)
Net deferred tax assets	186,788	119,418
Deferred tax liabilities:
Property, plant and equipment	(225,643)	(212,251)
Mobilization	(2,245)	(11,012)
Right-of-use assets	(5,461)
Other	(967)	(535)
Total deferred tax liabilities	(234,316)	(223,798)
Net deferred tax liability	$ (47,528)	$ (104,380)