Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Non-cash investing and financing activities:
Acquisition of property, plant and equipment in accounts payable and accrued liabilities	$ 11,997	$ 17,631
Final settlement of prior year stock repurchase forward contract	0	50,000
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	29,503	29,854
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 19,996	$ 25,422