Annual report pursuant to Section 13 and 15(d)

Segment Information - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Parenthetical) (Detail)

v3.8.0.1
Segment Information - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Selling, General and Administrative Expenses [Member] | China [Member]      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]      
Independent service providers service fees costs $ 419.5 $ 407.1 $ 403.5