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, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Income attributable to Dentsply International
Basic	$ 244,520	$ 265,708	$ 274,258
Diluted	$ 244,520	$ 265,708	$ 274,258
Shares
Basic	141,386	143,980	148,319
Incremental shares from assumed exercise of dilutive options	2,167	2,005	1,783
Diluted	143,553	145,985	150,102
Earnings per common share
Basic	$ 1.73	$ 1.85	$ 1.85
Diluted	$ 1.70	$ 1.82	$ 1.83