Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic earnings per share
Net income attributable to Albemarle Corporation	$ 37,732	$ 114,159	$ 145,775	$ 220,739
Weighted-average common shares for basic earnings per share	89,414	91,713	89,206	91,673
Basic earnings per share	$ 0.42	$ 1.24	$ 1.63	$ 2.41
Diluted earnings per share
Net income attributable to Albemarle Corporation	$ 37,732	$ 114,159	$ 145,775	$ 220,739
Weighted-average common shares for basic earnings per share	89,414	91,713	89,206	91,673
Incremental shares under stock compensation plans	637	1,082	793	983
Total shares	90,051	92,795	89,999	92,656
Diluted earnings per share	$ 0.42	$ 1.23	$ 1.62	$ 2.38