Income Tax - Components of Net Deferred Income Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets:
Property, Plant & Equipment	$ 94,439	$ 115,695
Net operating loss carryforward	178,279	174,479
Derivatives	14,438	2,448
Disallowed interest expense	5,579	5,388
Accrued liabilities	1,592	1,226
Other	3,469	1,717
Total deferred income tax assets	297,796	300,953
Valuation allowance	(297,195)	(300,386)
Net deferred income tax assets	601	567
Deferred income tax liabilities:
Derivatives	0	0
Other	601	567
Total deferred income tax liabilities	601	567
Net deferred income tax liabilities	$ 0	$ 0