Summary of Notional Amounts of Outstanding Foreign Exchange Forwards (Detail) € in Millions, $ in Millions	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 EUR (€)	Dec. 31, 2014 USD ($)
Contracts to Purchase USD with Euros [Member]
Derivative [Line Items]
Derivative Notional Amount | $				$ 38.5
Contracts to Sell USD for Euros [Member]
Derivative [Line Items]
Derivative Notional Amount | $		$ 70.1		51.1
Contracts to Purchase USD with GBP [Member]
Derivative [Line Items]
Derivative Notional Amount | $				0.2
Contracts to Purchase USD with Other Foreign Currencies [Member]
Derivative [Line Items]
Derivative Notional Amount | $				$ 1.2
Contracts to Purchase Euros with Other Foreign Currencies [Member]
Derivative [Line Items]
Derivative Notional Amount | €	€ 35.5		€ 34.0
Contracts to Sell Euros for Other Foreign Currencies [Member]
Derivative [Line Items]
Derivative Notional Amount | €	1.4
Contracts to Purchase Euros with GBP [Member]
Derivative [Line Items]
Derivative Notional Amount | €			25.0
Contracts to Sell Euros for GBP [Member]
Derivative [Line Items]
Derivative Notional Amount | €	€ 23.1		€ 38.2