Fair Values of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Fair Value Measurements [Line Items]
Fair value of derivative contracts	$ 46.9
Foreign Exchange Forward
Fair Value Measurements [Line Items]
Notional value of outstanding derivative contracts	$ 844.3

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

No definition available.

Name:	us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant