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Fair Value Measurements - Reconciliation of fair value measurements of available-for-sale debt investments (Details) - Available-for-sale Securities - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value Measurements
Beginning balance	¥ 1,961,474	¥ 1,196,330	¥ 939,432
Change in fair value	1,385,379	698,592	321,538
Disposal of part available-for-sale debt investments	(1,390,031)
Currency translation adjustment	57,715	64,552	(64,640)
Additional investments		2,000
Ending balance	¥ 2,014,537	¥ 1,961,474	¥ 1,196,330

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- Definition

Amount of additional investments of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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- Definition

Amount of change in fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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- Definition

Amount of currency translation adjustment of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

No definition available.

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset disposal of part available-for-sale debt investments.

+ References

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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