Supplemental equity information - Computation of Diluted Income (Loss) Per Share (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Warrants
Share-based Compensation Arrangement by Share-based Payment Award
Antidilutive securities excluded from computation of diluted income per share (in shares)	845	845	845	845
Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Antidilutive securities excluded from computation of diluted income per share (in shares)	6,068	6,068	6,068	6,068
Restricted stock grants
Share-based Compensation Arrangement by Share-based Payment Award
Antidilutive securities excluded from computation of diluted income per share (in shares)	11,789	46	11,789	10,577
2027 Notes
Share-based Compensation Arrangement by Share-based Payment Award
Antidilutive securities excluded from computation of diluted income per share (in shares)	97,057	0	97,057	99,419