Derivative Instruments and Hedging Strategies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Gain (Loss) from foreign currency exchange contracts in accumulated other comprehensive income	$ 13.0	$ 13.6	$ 15.9
Foreign Currency Derivatives
Derivative [Line Items]
Amount reclassified from accumulated other comprehensive income to earnings as related to forecasted revenue and operating expense transactions	$ 7.1
Maximum length of time over which hedging its exposure to the reduction in value of forecasted foreign currency cash flows through foreign currency forward contracts	12 months
Foreign Currency Derivatives | Maximum
Derivative [Line Items]
Maturity period of foreign currency derivatives	Dec. 31, 2019