Stockholders' Equity (Treasury stock activity) (Detail) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Capital Stock
Beginning balance	118,900,000
Ending balance	466,600,000
Ordinary Shares
Capital Stock
Beginning balance	119,200,000	119,000,000
Net capital increases due to the merger of FMC Technologies and Technip (in shares)	347,400,000
Ending balance	466,600,000	119,000,000
Ordinary Shares Held in Treasury and Employee Benefit Trust
Capital Stock
Net stock purchased for (sold from) employee benefit trust	100,000
Ending balance	100,000
Treasury Stock
Capital Stock
Beginning balance	300,000	800,000
Net stock purchased for (sold from) employee benefit trust (in shares)		(100,000)
Treasury stock cancellation due to the merger of FMC Technologies and Technip (in shares)	(300,000)
Ending balance		700,000