Schedule of Borrowings (Schedule of Debt, Narrative) (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
4.2% Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.20%		4.20%
Senior Notes, maturity date	Dec. 31, 2021	Dec. 31, 2021
4.5 % Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.50%
Senior Notes, maturity date	Dec. 31, 2020	Dec. 31, 2020
2.58% Senior Euro Notes
Debt Instrument [Line Items]
Stated interest rate	2.58%
Senior Notes, maturity date	Jun. 30, 2015	Jun. 30, 2015