Income Taxes - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Net operating loss carryovers	$ 1,400,000,000
Income tax benefit	69,689,000	$ (333,000)	$ 1,319,000
Unrecognized tax benefits, period increase (decrease)	0	0	0
Tax Cuts and Jobs Act of 2017, income tax benefit		$ 700,000	800,000
Tax Cuts and Jobs Act of 2017, measurement period adjustment			$ 207,700,000
Alternative minimum tax credit carryovers	800,000
Washington Refinery Acquisition
Income Tax Contingency [Line Items]
Income tax benefit	$ 64,200,000