Supplemental equity information - Computation of Diluted Income Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Warrants
Share-based Compensation Arrangement by Share-based Payment Award
Computation of diluted income per share (in shares)	845	845	1,362
Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Computation of diluted income per share (in shares)	6,068	6,068	2,905
Restricted stock grants
Share-based Compensation Arrangement by Share-based Payment Award
Computation of diluted income per share (in shares)	9,854	7,694	9,494
2027 Notes
Share-based Compensation Arrangement by Share-based Payment Award
Computation of diluted income per share (in shares)	98,168	27,482	0