Property and Equipment, Net (Tables)

12 Months Ended

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		—		—