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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Estimated Useful Lives of Property and Equipment | Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, as follows:
Category |  | Estimated useful life
Property |  | 25-46 years
Leasehold improvements |  | Over the shorter of lease term or the estimated useful lives of the assets
Optical fibers |  | 10-20 years
Computer and network equipment |  | 1-10 years
Office equipment |  | 1-8 years
Motor vehicles |  | 4-8 years
Weighted Average Useful Lives of Intangible Assets | Intangible assets have weighted average useful lives from the date of purchase/ acquisition as follows:
Purchased software |  |  | 4.4 years |
Radio spectrum license |  |  | 15 years |
Contract backlog* |  |  | 4.9 years |
Customer relationships* |  |  | 8.8 years |
Supplier relationships* |  |  | 10 years |
Licenses* |  |  | 15 years |
Trade Name* |  |  | 20 years |
Platform software* |  |  | 5 years |
Non-compete agreement* |  |  | 5 years |
Internal use software |  |  | 4.9 years |
| * | Acquired in the acquisitions of subsidiaries.
Summary of Impairment Charges Associated with Long-Lived Assets and Acquired Intangibles | The Company recorded impairment charges associated with its long-lived assets and acquired intangibles as follows:
|  | Years ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Impairment of equipment |  |  | — |  |  |  | 238,144 |  |  |  | 237,956 |  |  |  | 36,443 |
Impairment of intangible assets |  |  | — |  |  |  | 154,803 |  |  |  | 163,852 |  |  |  | 25,314 |
Interest Expense | As a result of total interest costs capitalized during the period, the interest expense for the year ended December 31, 2015, 2016 and 2017, was as follows:
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Interest expense and amortization cost of bonds |  |  | 172,677 |  |  |  | 113,367 |  |  |  | 63,354 |  |  |  | 9,738 |
Interest expense on bank and other borrowings |  |  | 55,391 |  |  |  | 46,377 |  |  |  | 87,916 |  |  |  | 13,512 |
Interest expense on capital lease |  |  | 57,189 |  |  |  | 66,687 |  |  |  | 63,757 |  |  |  | 9,799 |
Total interest costs |  |  | 285,257 |  |  |  | 226,431 |  |  |  | 215,027 |  |  |  | 33,049 |
Less: Total interest costs capitalized |  |  | (11,073 | ) |  |  | (27,842 | ) |  |  | (29,714 | ) |  |  | (4,567 | )
Interest expense, net |  |  | 274,184 |  |  |  | 198,589 |  |  |  | 185,313 |  |  |  | 28,482 |

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- Definition Tabular disclosure for impairment of long-lived assets held and used by an entity which includes a description of the impaired long-lived asset and facts and circumstances leading to the impairment, aggregate amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired long-lived asset is reported. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.CC) -URI http://asc.fasb.org/extlink&oid=27011434&loc=d3e125687-122742 + Details
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