Open Tax Year (Detail)	12 Months Ended
	Dec. 31, 2014
U.S. | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Open tax year	2011
U.S. | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Open tax year	2014
Japan | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Open tax year	2008
Japan | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Open tax year	2014
Germany | Earliest Tax Year [Member]
Income Tax Examination [Line Items]
Open tax year	2010
Germany | Latest Tax Year [Member]
Income Tax Examination [Line Items]
Open tax year	2014