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Weighted Average Useful Lives of Intangible Assets (Detail) | 12 Months Ended
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Dec. 31, 2017
Purchased software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 4 years 4 months 24 days |
Radio Spectrum License |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 15 years |
Contract Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 4 years 10 months 24 days | [1]
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 8 years 9 months 18 days | [1]
Supplier Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 10 years | [1]
Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 15 years | [1]
Trade Names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 20 years | [1]
Platform Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 5 years | [1]
Non-complete agreement |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 5 years | [1]
Internal Use Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 4 years 10 months 24 days |
[1] | Acquired in the acquisitions of subsidiaries

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