Summary of Notional Amounts of Outstanding Foreign Exchange Forwards, Cash Flow Hedging (Detail) € in Millions, $ in Millions	Jun. 30, 2016 EUR (€)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)
Contracts to Sell USD for Euros [Member]
Derivative [Line Items]
Derivative Notional Amount | $		$ 72.6		$ 70.1
Contracts to Purchase Euros with Other Foreign Currencies [Member]
Derivative [Line Items]
Derivative Notional Amount	€ 34.4		€ 35.5
Contracts to Sell Euros for Other Foreign Currencies [Member]
Derivative [Line Items]
Derivative Notional Amount			1.4
Contracts to Sell Euros for GBP [Member]
Derivative [Line Items]
Derivative Notional Amount	€ 36.2		€ 23.1