Business and geographic segments - Holding Percentage of Subsidiaries (Detail)	Dec. 31, 2023
Chemicals
Segment Reporting Information [Line Items]
Controlling interest in subsidiary	81.00%
Component products
Segment Reporting Information [Line Items]
Controlling interest in subsidiary	87.00%
Real estate management and development | BMI
Segment Reporting Information [Line Items]
Controlling interest in subsidiary	63.00%
Real estate management and development | LandWell | Aggregate General And Limited Interests
Segment Reporting Information [Line Items]
Controlling interest in subsidiary	77.00%