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Derivatives and Hedging Activity - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]      
Foreign exchange risk management We are exposed to foreign exchange risk when we earn revenues, pay expenses, or enter into monetary intercompany transfers denominated in a currency that differs from our functional currency, or other transactions that are denominated in a currency other than our functional currency. We use foreign exchange derivatives, typically forward contracts and options, to reduce our overall exposure to the effects of currency fluctuations on cash flows. These exposures are hedged, on average, for less than two years.    
Interest exchange risk management We enter into various long-term debt agreements. We use interest rate derivatives, typically swaps, to reduce our exposure to the effects of interest rate fluctuations on the forecasted interest rates for up to two years into the future.    
Gain (loss) related to hedge ineffectiveness $ (0.5) $ 0.2  
Scenario, Forecast [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Estimated pretax gains to be reclassified from accumulated other comprehensive loss into earnings     $ 4.3