Fair Values of Financial Instruments - Additional Information (Detail) (USD $)	Dec. 31, 2014
Fair Value Measurements [Line Items]
Fair value of derivative contracts	$ 46,900,000
Foreign Exchange Forward
Fair Value Measurements [Line Items]
Notional value of outstanding derivative contracts	$ 844,300,000

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