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Property and Equipment, Net (Tables) | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property and Equipment Including Those Held under Capital Leases | Property and equipment, including those held under capital leases, consist of the following:
|  | December 31, |
|  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | US$ |
At cost: |  |  |  |  |  |  |  |  |  |  |  |
Property |  |  | 490,430 |  |  |  | 467,312 |  |  |  | 71,825 |
Leasehold improvements |  |  | 666,051 |  |  |  | 789,734 |  |  |  | 121,380 |
Computer and network equipment |  |  | 2,926,278 |  |  |  | 2,681,759 |  |  |  | 412,179 |
Optical fibers |  |  | 207,423 |  |  |  | 142,723 |  |  |  | 21,936 |
Office equipment |  |  | 19,591 |  |  |  | 12,671 |  |  |  | 1,947 |
Motor vehicles |  |  | 8,144 |  |  |  | 1,891 |  |  |  | 291 |
|  |  | 4,317,917 |  |  |  | 4,096,090 |  |  |  | 629,558 |
Less: Accumulated depreciation |  |  | (1,342,041 | ) |  |  | (1,326,511 | ) |  |  | (203,881 | )
Impairment |  |  | (238,144 | ) |  |  | — |  |  |  | — |
|  |  | 2,737,732 |  |  |  | 2,769,579 |  |  |  | 425,677 |
Construction-in-progress |  |  | 1,043,881 |  |  |  | 549,845 |  |  |  | 84,509 |
|  |  | 3,781,613 |  |  |  | 3,319,424 |  |  |  | 510,186 |
Depreciation Expense | Depreciation expense was RMB402,035, RMB480,105 and RMB523,500 (US$80,460) for the years ended December 31, 2015, 2016 and 2017, respectively, and were included in the following captions:
|  | For the years ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Cost of revenues |  |  | 328,217 |  |  |  | 397,014 |  |  |  | 458,655 |  |  |  | 70,494 |
Sales and marketing expenses |  |  | 5,670 |  |  |  | 3,759 |  |  |  | 3,188 |  |  |  | 490 |
General and administrative expenses |  |  | 29,753 |  |  |  | 45,746 |  |  |  | 41,675 |  |  |  | 6,405 |
Research and development expenses |  |  | 38,395 |  |  |  | 33,586 |  |  |  | 19,982 |  |  |  | 3,071 |
|  |  | 402,035 |  |  |  | 480,105 |  |  |  | 523,500 |  |  |  | 80,460 |
Carrying Amounts of Property and Equipment Held under Capital Leases | The carrying amounts of the Company’s property and equipment held under capital leases at respective balance sheet dates were as follows:
|  | December 31, |
|  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | US$ |
Property |  |  | 365,353 |  |  |  | 365,353 |  |  |  | 56,154 |
Computer and network equipment |  |  | 431,948 |  |  |  | 497,532 |  |  |  | 76,469 |
Optical fibers |  |  | 207,423 |  |  |  | 142,723 |  |  |  | 21,936 |
|  |  | 1,004,724 |  |  |  | 1,005,608 |  |  |  | 154,559 |
Less: Accumulated depreciation |  |  | (238,765 | ) |  |  | (262,601 | ) |  |  | (40,361 | )
|  |  | 765,959 |  |  |  | 743,007 |  |  |  | 114,198 |
Construction-in-progress |  |  | 35,906 |  |  |  | 130,192 |  |  |  | 20,010 |
|  |  | 801,865 |  |  |  | 873,199 |  |  |  | 134,208 |
Carrying Amounts of Property and Equipment Pledged to Secure Banking Borrowings | The carrying amounts of property and equipment pledged by the Company to secure banking borrowings (Note 13) granted to the Company at the respective balance sheet dates were as follows:
|  | December 31, |
|  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | US$ |
Property |  |  | 7,938 |  |  |  | — |  |  |  | — |
Leasehold improvements |  |  | — |  |  |  | 143,893 |  |  |  | 22,116 |
Computer and network equipment |  |  | 31,506 |  |  |  | 200,954 |  |  |  | 30,886 |
Office equipment |  |  | — |  |  |  | 85 |  |  |  | 13 |
Construction-in-progress |  |  | 318,259 |  |  |  | — |  |  |  | — |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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