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Short-Term Loans and Long-Term Debt - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Debt Disclosure [Line Items]
Short-term loans consisting of bank borrowings	¥ 4,641	¥ 2,071
Weighted average interest rate on short-term loans outstanding	2.72%	1.46%
Secure Loans from Banks
Debt Disclosure [Line Items]
Property, plant and equipment, mortgage primarily to secure loans from bank	¥ 2,913

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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