Contingencies - Additional Information (Detail) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2009 Employment and Benefits Litigation [Member] USD ($) Employees	Jun. 30, 2009 Employment and Benefits Litigation [Member] EUR (€)	Dec. 31, 2012 Employment and Benefits Litigation [Member] USD ($) Employees	Dec. 31, 2012 Employment and Benefits Litigation [Member] EUR (€)	Dec. 31, 2012 Unauthorized Activities [Member] USD ($)	Dec. 31, 2012 Unauthorized Activities [Member] JPY (¥)	Dec. 31, 2012 Unauthorized Activities [Member] Borrowing One [Member] USD ($)	Dec. 31, 2012 Unauthorized Activities [Member] Borrowing One [Member] JPY (¥)	Dec. 31, 2012 Unauthorized Activities [Member] Borrowing Two [Member] USD ($)	Dec. 31, 2012 Unauthorized Activities [Member] Borrowing Two [Member] JPY (¥)	Dec. 31, 2012 Unauthorized Activities [Member] Borrowing Three [Member] USD ($)	Dec. 31, 2012 Unauthorized Activities [Member] Borrowing Three [Member] JPY (¥)	Dec. 31, 2012 Unauthorized Activities [Member] Borrowing Four [Member] USD ($)	Dec. 31, 2012 Unauthorized Activities [Member] Borrowing Four [Member] JPY (¥)
Loss Contingencies [Line Items]
Number of terminated employees	280	280
Amount sought by former employees from company	$ 30.9	€ 24.0
Amount awarded to plaintiffs			2.6	2.0
Number of employees called for hearing			190	190
Liabilities due against law suit			2.5	1.9
Claim on payment of outstanding borrowings							34.8	3,000.0	58.1	5,000.0	58.1	5,000.0	23.2	2,000.0
Claim on payment for loan related expenses					1.2	106.0
Claim on payment for interest and delay damages					$ 66.2	¥ 5,700.0