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Basis of Presentation and Significant Accounting Policies - Estimated Useful Life of Assets (Detail)
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12 Months Ended |
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Dec. 31, 2013
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Leasehold improvements [Member] | Maximum [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
15 years |
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Buildings [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
39 years |
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Vehicles [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
5 years |
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Office equipment [Member] | Minimum [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
5 years |
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Office equipment [Member] | Maximum [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
7 years |
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Computer Equipment [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
5 years |
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Computer software [Member] | Minimum [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
3 years |
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Computer software [Member] | Maximum [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
5 years |
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Satellite equipment [Member] | Minimum [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
3 years |
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Satellite equipment [Member] | Maximum [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
5 years |
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Warehouse equipment [Member] | Minimum [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
7 years |
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Warehouse equipment [Member] | Maximum [Member]
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| Property Plant And Equipment Estimated Useful Lifes [Line Items] |
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| Estimated useful life |
10 years |