Transfers of Financial Assets - Additional Information (Detail) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Transfer of Financial Assets Accounted for as Sales [Line Items]
Aggregate face value of receivables sold	$ 1,260,700,000	$ 582,700,000
Cash proceeds from receivables	1,260,100,000	582,300,000
Proceeds from customers	1,007,800,000	314,000,000
Repurchase of accounts receivables sold	121,000,000	$ 31,000,000
Proceeds from other current liabilities	40,600,000		$ 103,500,000
Incremental operating cash inflows	30,000,000
Revolving Credit Facility [Member]
Transfer of Financial Assets Accounted for as Sales [Line Items]
Current maximum funding limit	400,000,000
U.S and Japan Revolving Arrangements [Member]
Transfer of Financial Assets Accounted for as Sales [Line Items]
Maximum exposures to loss associated	30,500,000		22,900,000
Derecognized net receivables outstanding amount	$ 338,900,000		$ 261,200,000