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Derivative Financial Assets and Liabilities Measured at Fair Value on Recurring Basis for Continuing Operations (Detail) - Not Designated as Hedging Instrument - Fair Value, Measurements, Recurring - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Nominal volume $ 1,136,000,000 $ 468,200,000
Derivative asset 2,000,000 2,400,000
Derivative liability 3,800,000 300,000
Less Than Six Months | Foreign Exchange Swaps    
Derivatives, Fair Value [Line Items]    
Nominal volume 1,136,000,000 [1] 468,200,000 [2]
Less Than Six Months | Foreign Exchange Swaps | Other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset 2,000,000 [3] 2,400,000 [4]
Less Than Six Months | Foreign Exchange Swaps | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability $ 3,800,000 [5] $ 300,000 [6]
[1] Net nominal amount after deducting for offsetting swaps under ISDA agreements is $1,136.0 million.
[2] Net nominal amount after deducting for offsetting swaps under ISDA agreements is $468.2 million.
[3] Net amount after deducting for offsetting swaps under ISDA agreements is $2.0 million.
[4] Net amount after deducting for offsetting swaps under ISDA agreements is $2.4 million.
[5] Net amount after deducting for offsetting swaps under ISDA agreements is $3.8 million.
[6] Net amount after deducting for offsetting swaps under ISDA agreements is $0.3 million.