Additional Information Regarding Outstanding, Exercisable and Vested and Exercisable Stock Options and Warrants (Detail) (USD $)	Sep. 30, 2011 Year	Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 0.30
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 710.84
Options Outstanding - Number of Shares	10,562,187	11,525,422
Options Outstanding - Weighted-Average Remaining Life (Years)	5.9
Options Outstanding - Weighted-Average Exercise Price	$ 353.12	$ 330.24
Options Exercisable - Number of Shares	6,374,958
Options Exercisable - Weighted-Average Exercise Price	$ 303.75
Options Vested and Exercisable - Number of Shares	6,351,819
Options Vested and Exercisable - Weighted-Average Exercise Price	$ 304.59
Range 1
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 0.30
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 94.80
Options Outstanding - Number of Shares	348,750
Options Outstanding - Weighted-Average Remaining Life (Years)	2.8
Options Outstanding - Weighted-Average Exercise Price	$ 28.53
Options Exercisable - Number of Shares	346,027
Options Exercisable - Weighted-Average Exercise Price	$ 28.03
Options Vested and Exercisable - Number of Shares	322,888
Options Vested and Exercisable - Weighted-Average Exercise Price	$ 24.80
Range 2
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 117.84
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 198.41
Options Outstanding - Number of Shares	505,183
Options Outstanding - Weighted-Average Remaining Life (Years)	2.9
Options Outstanding - Weighted-Average Exercise Price	$ 178.28
Options Exercisable - Number of Shares	505,183
Options Exercisable - Weighted-Average Exercise Price	$ 178.28
Options Vested and Exercisable - Number of Shares	505,183
Options Vested and Exercisable - Weighted-Average Exercise Price	$ 178.28
Range 3
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 205.96
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 298.86
Options Outstanding - Number of Shares	563,389
Options Outstanding - Weighted-Average Remaining Life (Years)	3.4
Options Outstanding - Weighted-Average Exercise Price	$ 274.44
Options Exercisable - Number of Shares	558,486
Options Exercisable - Weighted-Average Exercise Price	$ 274.32
Options Vested and Exercisable - Number of Shares	558,486
Options Vested and Exercisable - Weighted-Average Exercise Price	$ 274.32
Range 4
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 300.97
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 399.00
Options Outstanding - Number of Shares	5,946,677
Options Outstanding - Weighted-Average Remaining Life (Years)	5.3
Options Outstanding - Weighted-Average Exercise Price	$ 309.68
Options Exercisable - Number of Shares	4,081,093
Options Exercisable - Weighted-Average Exercise Price	$ 309.72
Options Vested and Exercisable - Number of Shares	4,081,093
Options Vested and Exercisable - Weighted-Average Exercise Price	$ 309.72
Range 5
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 401.78
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 499.07
Options Outstanding - Number of Shares	972,434
Options Outstanding - Weighted-Average Remaining Life (Years)	7.0
Options Outstanding - Weighted-Average Exercise Price	$ 439.16
Options Exercisable - Number of Shares	484,559
Options Exercisable - Weighted-Average Exercise Price	$ 437.30
Options Vested and Exercisable - Number of Shares	484,559
Options Vested and Exercisable - Weighted-Average Exercise Price	$ 437.30
Range 6
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 501.27
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 595.35
Options Outstanding - Number of Shares	1,941,386
Options Outstanding - Weighted-Average Remaining Life (Years)	8.8
Options Outstanding - Weighted-Average Exercise Price	$ 532.02
Options Exercisable - Number of Shares	396,065
Options Exercisable - Weighted-Average Exercise Price	$ 518.43
Options Vested and Exercisable - Number of Shares	396,065
Options Vested and Exercisable - Weighted-Average Exercise Price	$ 518.43
Range 7
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 601.17
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 699.35
Options Outstanding - Number of Shares	284,288
Options Outstanding - Weighted-Average Remaining Life (Years)	9.4
Options Outstanding - Weighted-Average Exercise Price	$ 610.19
Options Exercisable - Number of Shares	3,470
Options Exercisable - Weighted-Average Exercise Price	$ 620.36
Options Vested and Exercisable - Number of Shares	3,470
Options Vested and Exercisable - Weighted-Average Exercise Price	$ 620.36
Range 8
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Range of Exercise Prices, Lower Limit	$ 710.84
Options Outstanding - Range of Exercise Prices, Upper Limit	$ 710.84
Options Outstanding - Number of Shares	80
Options Outstanding - Weighted-Average Remaining Life (Years)	6.2
Options Outstanding - Weighted-Average Exercise Price	$ 710.84
Options Exercisable - Number of Shares	75
Options Exercisable - Weighted-Average Exercise Price	$ 710.84
Options Vested and Exercisable - Number of Shares	75
Options Vested and Exercisable - Weighted-Average Exercise Price	$ 710.84

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

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on fully vested options outstanding and currently exercisable under the stock option plan.

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Lower range limit of the exercise price of outstanding options.

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Upper range limit of the exercise price of outstanding options.

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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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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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