Long term debt - Summary of Components of Long-term Debt (Parenthetical) (Detail) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Debt instrument, maturity description		The Amended 2021 Credit Agreement matures on February 8, 2026, unless the Convertible Debentures are outstanding six months prior to the December 19, 2024 maturity date thereof, in which case the Amended 2021 Credit Agreement matures on June 19, 2024. As of June 30, 2023, the Company does not anticipate repaying the Convertible Debentures by June 19, 2024 and as such, the Term Loan debt of $293.3 million is now included in the current portion of long-term debt.
Term Loan debt		$ 543,034	$ 539,558
Amended 2021 Credit Agreement Due 2026
Debt Instrument [Line Items]
Term Loan debt	[1],[2]	293,250	$ 294,750
Amended 2021 Credit Agreement Due 2026 | Current Portion of Long Term Debt
Debt Instrument [Line Items]
Term Loan debt		$ 293,300

[1] The 2021 Credit Agreement was amended on March 3, 2023.

[2] The Amended 2021 Credit Agreement matures on February 8, 2026, unless the Convertible Debentures are outstanding six months prior to the December 19, 2024 maturity date thereof, in which case the Amended 2021 Credit Agreement matures on June 19, 2024. As of June 30, 2023, the Company does not anticipate repaying the Convertible Debentures by June 19, 2024 and as such, the Term Loan debt of $293.3 million is now included in the current portion of long-term debt.