Effect of Derivative Instruments on Financial Statements (Detail) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivatives Designated as Hedges:
Amount of gain (loss) recognized in other comprehensive income (loss)	$ 3,311	$ (7,318)	$ 11,378	$ (12,271)
Income (loss) reclassified from AOCI into income: effective portion, Cost of operations	93	2,625	(42)	2,887
Loss recognized in income: ineffective portion and amount excluded from effectiveness testing, Other income (expense) - net	$ 147	$ (1,717)	$ (1,823)	$ (4,066)

The amount of net gains or losses on a cash flow hedge reclassified in the period to cost of sales from accumulated other comprehensive income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-Subparagraph b
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80784-113994

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration