Employee benefit plans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Loss on pension plan termination		$ 4,911
Loss on pension plan termination		(4,911)	$ (104)
Defined contribution pension plans		$ 3,900	3,900	$ 3,700
Equities | United States
Defined Benefit Plan Disclosure [Line Items]
Long-term return on plan assets		7.00%
Plan asset target allocation		33.00%
Fixed Income | United States
Defined Benefit Plan Disclosure [Line Items]
Long-term return on plan assets		5.00%
Plan asset target allocation		59.00%
Funds | Assets Measured at NAV | United States
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets		98.00%
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Loss on pension plan termination	$ 4,900
Plan benefit obligation		$ 29,438	36,090	50,367
Fair value of plan assets		27,810	34,126	$ 47,940
Expected contributions to Defined Benefit Plans in Next Fiscal Year		1,000
Net underfunded status of defined benefit pension plans		$ 1,628	$ 1,964
Weighted-average rate determining the actuarial present value of benefit obligation		5.00%	5.10%
Long-term return on plan assets		4.90%	3.30%	3.30%
Defined Benefit Pension Plans | United States
Defined Benefit Plan Disclosure [Line Items]
Plan benefit obligation		$ 29,438	$ 30,254
Fair value of plan assets		27,810	27,185
Defined Benefit Pension Plans | Assets Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		27,280	24,395
Defined Benefit Pension Plans | Equities | United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		7,786	8,591
Defined Benefit Pension Plans | Equities | Assets Measured at NAV | United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		7,786	7,897
Defined Benefit Pension Plans | Fixed Income | United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		18,733	15,954
Defined Benefit Pension Plans | Fixed Income | Assets Measured at NAV | United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 18,733	$ 15,805