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	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Supplemental cash flows:
Cash paid for interest, net of amounts capitalized	$ 2,325	$ 6,028
Cash paid for reorganization items, net	187	656
Noncash investing and financing activities:
Increase (decrease) in capital expenditures in payables and accrued liabilities	$ (2,612)	$ 1,890