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Data Type:	xbrli:stringItemType
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Period Type:	duration

The cash outflow to reacquire common stock during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
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Data Type:	xbrli:monetaryItemType
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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Number of shares that have been repurchased and retired during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Topic 505
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Topic 210
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
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-Name Accounting Standards Codification
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-Paragraph 1
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Number of shares that have been repurchased during the period and are being held in treasury.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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-Topic 505
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Data Type:	xbrli:sharesItemType
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Period Type:	duration

Total number of shares that are being held in treasury for restricted share award at the end of the year.

No definition available.

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Data Type:	xbrli:sharesItemType
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Number of shares that have been repurchased during the period and are being held in treasury in the form of American Depositary Share.

No definition available.

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Namespace Prefix:	zh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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Value of shares that are being held in treasury for restricted shares award At the end of the year.

No definition available.