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Subsequent Events - Additional Information (Detail) (Subsequent Event, JPY ¥) In Millions, unless otherwise specified	1 Months Ended
	May 15, 2013
Subsequent Event
Subsequent Event [Line Items]
Proceeds of sale and leaseback transactions	¥ 76,566
Sale and leaseback transaction terms	The leasebacks were capital leases with terms that average three years.

A description of the terms of the lease(s) related to the assets being leased-back in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

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