Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Basic earnings per share
Net income attributable to Albemarle Corporation	$ 83,987	$ 114,262
Weighted-average common shares for basic earnings per share	88,719	88,997
Basic earnings per share	$ 0.95	$ 1.28
Diluted earnings per share
Net income attributable to Albemarle Corporation	$ 83,987	$ 114,262
Weighted-average common shares for basic earnings per share	88,719	88,997
Incremental shares under stock compensation plans	517	950
Total shares	89,236	89,947
Diluted earnings per share	$ 0.94	$ 1.27