Long term debt - Summary of Components of Long-term Debt (Parenthetical) (Detail)	12 Months Ended
Dec. 31, 2022
Long-Term Debt, Unclassified [Abstract]
Debt instrument, maturity description	The 2021 Credit Agreement matures on February 8, 2026, unless the Debentures are outstanding six months prior to the December 19, 2024 maturity date thereof, in which case the 2021 Credit Agreement matures on June 19, 2024.

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentMaturityDateDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration