Summary of Significant Accounting Policies - Summary of Estimated Useful Life of Fixed Assets (Detail)
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12 Months Ended |
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Dec. 31, 2012
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Leasehold Improvements [Member]
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Property, Plant and Equipment [Line Items] | |
Estimated useful lives, years | Shorter of the lease term or useful life of the asset |
Minimum [Member] | Computer Equipment [Member]
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Property, Plant and Equipment [Line Items] | |
Useful life, years | 3 years |
Minimum [Member] | Furniture and Fixtures [Member]
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|
Property, Plant and Equipment [Line Items] | |
Useful life, years | 3 years |
Minimum [Member] | Office Equipment [Member]
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|
Property, Plant and Equipment [Line Items] | |
Useful life, years | 3 years |
Minimum [Member] | Software [Member]
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|
Property, Plant and Equipment [Line Items] | |
Useful life, years | 3 years |
Maximum [Member] | Computer Equipment [Member]
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|
Property, Plant and Equipment [Line Items] | |
Useful life, years | 5 years |
Maximum [Member] | Furniture and Fixtures [Member]
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|
Property, Plant and Equipment [Line Items] | |
Useful life, years | 10 years |
Maximum [Member] | Office Equipment [Member]
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|
Property, Plant and Equipment [Line Items] | |
Useful life, years | 10 years |
Maximum [Member] | Software [Member]
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|
Property, Plant and Equipment [Line Items] | |
Useful life, years | 5 years |