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Condensed Financial Information of the Company - Condensed Balance Sheets (Parenthetical) (Detail)	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 ¥ / shares shares	May 31, 2014 shares
Ordinary shares, shares authorized			10,000,000,000
Treasury stock, shares	0	25,368,080
Parent Company [Member]
Treasury stock, shares	0	25,368,080
Common Class A [Member]
Ordinary shares, par value | $ / shares	$ 0.000025
Ordinary shares, shares authorized	7,600,000,000	7,600,000,000
Ordinary shares, shares issued	415,250,897	410,608,263
Ordinary shares, shares outstanding	409,345,857	380,922,773
Common Class A [Member] | Parent Company [Member]
Ordinary shares, par value | (per share)	$ 0.000025	¥ 0.000025
Ordinary shares, shares authorized	7,600,000,000	7,600,000,000
Ordinary shares, shares issued	415,250,897	410,608,263
Ordinary shares, shares outstanding	409,345,857	380,922,773
Common Class B [Member]
Ordinary shares, par value | $ / shares	$ 0.000025
Ordinary shares, shares authorized	1,400,000,000	1,400,000,000
Ordinary shares, shares issued	1,006,398,742	1,015,128,452
Ordinary shares, shares outstanding	992,705,325	1,003,326,973
Common Class B [Member] | Parent Company [Member]
Ordinary shares, par value | (per share)	$ 0.000025	¥ 0.000025
Ordinary shares, shares authorized	1,400,000,000	1,400,000,000
Ordinary shares, shares issued	1,006,398,742	1,015,128,452
Ordinary shares, shares outstanding	992,705,325	1,003,326,973

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Face amount or stated value per share of common stock.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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