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Summary of significant accounting policies (Details 2) | 12 Months Ended
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Dec. 31, 2011 Y
Buildings |
Useful lives of long-lived assets |
Useful life, minimum (in years) | 25
Useful life, maximum (in years) | 33
Plant and equipment |
Useful lives of long-lived assets |
Useful life, minimum (in years) | 2
Useful life, maximum (in years) | 10
Furniture and fixtures |
Useful lives of long-lived assets |
Useful life, minimum (in years) | 4
Useful life, maximum (in years) | 8
Instrumentation |
Useful lives of long-lived assets |
Useful life, minimum (in years) | 3
Useful life, maximum (in years) | 4

X
- Details
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- Definition The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
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- Definition The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
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