Long term debt - Summary of Future Principal Payments, Including in Kind Interest (Parenthetical) (Detail) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Term loan debt		$ 552,676	$ 539,558
Amended 2021 Credit Agreement Due 2026
Debt Instrument [Line Items]
Term loan debt	[1],[2]	291,750	$ 294,750
Current Portion of Long Term Debt [Member] | Amended 2021 Credit Agreement Due 2026
Debt Instrument [Line Items]
Term loan debt		$ 291,800

[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 December 31, 2023, the Company does not anticipate repaying the Convertible Debentures by June 19, 2024 and as such, the Term Loan debt of $291.8 million and the Convertible Debentures of $260.9 million are included in the current portion of long-term debt.