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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
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