Fair Value of Derivative Instruments in Consolidated Balance Sheet (Detail) (Foreign Exchange Contract, JPY ¥) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets designated as Hedging Instrument	¥ 1,325	¥ 2,487
Derivative assets not designated as Hedging Instrument	3,393	9,463
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivatives liabilities designated as hedging instruments	1,270	426
Derivatives liabilities not designated as hedging instruments	¥ 1,340	¥ 487

Aggregate fair value of all derivative liabilities designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

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