Computation of Basic and Diluted Earnings Per Common Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Income attributable to Dentsply International
Basic	$ 314,213	$ 244,520	$ 265,708
Diluted	$ 314,213	$ 244,520	$ 265,708
Shares
Basic	141,850	141,386	143,980
Incremental shares from assumed exercise of dilutive options	2,095	2,167	2,005
Diluted	143,945	143,553	145,985
Earnings per common share
Basic	$ 2.22	$ 1.73	$ 1.85
Diluted	$ 2.18	$ 1.70	$ 1.82