Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Options Outstanding - Number of Shares
December 31, 2011	1,522,624
Grants	1,184,487
Exercised	(362,699)
Terminated	(49,315)
Outstanding at December 31, 2012	2,295,097
Vested at December 31, 2012	445,778
Exercisable at December 31, 2012	445,778
Options Outstanding - Weighted Average Exercise Price
December 31, 2011	$ 51.81
Grants	$ 62.02
Exercised	$ 21.01
Terminated	$ 62.27
Outstanding at December 31, 2012	$ 61.72
Vested at December 31, 2012	$ 50.21
Exercisable at December 31, 2012	$ 50.21
Options Outstanding - Aggregate Intrinsic Value
Outstanding at December 31, 2012	$ 3,439
Vested at December 31, 2012	5,800
Exercisable at December 31, 2012	$ 5,800
Options Outstanding - Average Remaining Life
Outstanding at December 31, 2012	8 years 6 months 26 days
Vested at December 31, 2012	4 years 5 months 9 days
Exercisable at December 31, 2012	4 years 5 months 9 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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