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Long-term debt - Long-term debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 03, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total principal long-term debt	$ 3,256,000		$ 3,582,000
Debt issuance costs	(31,378)		(36,595)
Unamortized premiums and discounts, net	7,348		7,815
Total long-term debt	3,231,970		3,553,220
Borrowings under revolving credit facility expiring August 2024
Debt Instrument [Line Items]
Total principal long-term debt	$ 166,000		355,000
Unsecured notes bearing fixed rate interest at 5.50% due September 2024 \| Senior Notes
Debt Instrument [Line Items]
Interest rate stated percentage	5.50%	5.50%
Total principal long-term debt	$ 0		137,000
Unsecured notes bearing fixed rate interest at 4.75% due March 2026 \| Senior Notes
Debt Instrument [Line Items]
Interest rate stated percentage	4.75%
Total principal long-term debt	$ 550,000		550,000
Unsecured notes bearing fixed rate interest at 7.75% due June 2027 \| Senior Notes
Debt Instrument [Line Items]
Interest rate stated percentage	7.75%
Total principal long-term debt	$ 200,000		200,000
Unsecured notes bearing fixed rate interest at 7.25% due September 2027 \| Senior Notes
Debt Instrument [Line Items]
Interest rate stated percentage	7.25%
Total principal long-term debt	$ 240,000		240,000
Unsecured notes bearing fixed rate interest at 4.625% due March 2028 \| Senior Notes
Debt Instrument [Line Items]
Interest rate stated percentage	4.625%
Total principal long-term debt	$ 1,000,000		1,000,000
Unsecured notes bearing fixed rate interest at 5.00% due September 2029 \| Senior Notes
Debt Instrument [Line Items]
Interest rate stated percentage	5.00%
Total principal long-term debt	$ 1,100,000		$ 1,100,000