Income Taxes - Summary of Loss Before Income Taxes (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Income Tax Disclosure [Abstract]
Non-PRC	¥ (670,529)	$ (97,524)	¥ 99,787	¥ (23,273)
PRC	(8,311,901)	(1,208,915)	(3,844,284)	(3,037,661)
Loss before income taxes	¥ (8,982,430)	$ (1,306,439)	¥ (3,744,497)	¥ (3,060,934)

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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