Derivative Instruments (Forward Contracts Amounts Recorded In Consolidated Balance Sheet) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Total Assets	$ 9,319	$ 9,210
Prepaid Expenses And Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Assets	$ 9,319	$ 9,210

Fair value of the gross assets less the gross liabilities of a derivative asset or group of derivative assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Section 45

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Name:	us-gaap_DerivativeAssetFairValueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant