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Estimated Useful lives Of Fixed Assets (Detail) | 12 Months Ended
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Dec. 31, 2011 Year
Office building |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life, minimum (in years) | 45
Office building related facility, machinery and equipment |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life, minimum (in years) | 15
Computer equipment |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life, minimum (in years) | 3
Property, plant and equipment, useful life, maximum (in years) | 5
Internal use software development costs |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life, minimum (in years) | 3
Office equipment |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life, minimum (in years) | 3
Property, plant and equipment, useful life, maximum (in years) | 5
Vehicles |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life, minimum (in years) | 5
Leasehold improvements |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, useful life (in years) | Over the shorter of lease terms or estimated useful lives of the assets

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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 + Details
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- 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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