|
Allocation of Aggregate Purchase Price of Acquisitions (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2012
Minimum
|
Dec. 31, 2012
Maximum
|
Dec. 31, 2011
Series of Individually Immaterial Business Acquisitions
|
Dec. 31, 2011
Series of Individually Immaterial Business Acquisitions
Minimum
|
Dec. 31, 2011
Series of Individually Immaterial Business Acquisitions
Maximum
|
Dec. 31, 2012
Kiva Systems, Inc
|
Dec. 31, 2012
Kiva Systems, Inc
Minimum
|
Dec. 31, 2012
Kiva Systems, Inc
Maximum
|
||||
| Schedule of Business Acquisitions, Purchase Price Allocation [Line Items] | ||||||||||||
| Acquired intangible assets estimated useful lives | 1 year | 10 years | 2 years | 10 years | 4 years | 10 years | ||||||
| Acquired intangible assets, weighted-average amortization period (in years) | 5 years 1 month 6 days | [1] | 8 years | 5 years | ||||||||
| Purchase price allocation, contingent liability related to historic tax exposures | $ 38 | |||||||||||
|
||||||||||||