Supplemental Disclosures to the Unaudited Condensed Consolidated Balance Sheets and Unaudited Condensed Consolidated Statements of Cash Flows - Summary of Supplemental Cash Flows (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Supplemental cash flows:
Cash paid for interest, net of amounts capitalized	$ 4,429	$ 5,380
Cash paid for reorganization items, net	6	351
Cash paid for taxes	0	85
Noncash investing and financing activities:
Increase (decrease) in capital expenditures in payables and accrued liabilities	$ 5,203	$ (3,618)