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Condensed Financial Information of the Parent Company - Schedule of Condensed Balance Sheet (Parenthetical) (Detail) - $ / shares | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 20, 2017 | Jun. 30, 2012
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Consolidated Balance Sheet Statements Captions [Line Items] |  |  |  |
Ordinary stock, par value | $ 0.00001 |  | $ 0.00001 | $ 0.00001
Ordinary stock, authorized |  |  |  | 4,266,159,600
Ordinary stock, shares issued | 1,550,071,169 |  |  |
Class A Ordinary Shares [Member] |  |  |  |
Consolidated Balance Sheet Statements Captions [Line Items] |  |  |  |
Ordinary stock, par value | $ 0.00001 | $ 0.00001 |  |
Ordinary stock, authorized | 10,000,000,000 | 10,000,000,000 |  |
Ordinary stock, shares issued | 964,071,169 | 874,071,169 |  |
Ordinary Stock, shares outstanding | 943,436,904 | 827,770,169 |  |
Class B Ordinary Shares [Member] |  |  |  |
Consolidated Balance Sheet Statements Captions [Line Items] |  |  |  |
Ordinary stock, par value | $ 0.00001 | $ 0.00001 |  |
Ordinary stock, authorized | 10,000,000,000 | 10,000,000,000 |  |
Ordinary stock, shares issued | 586,000,000 | 659,000,000 |  |
Ordinary Stock, shares outstanding | 586,000,000 | 659,000,000 |  |
Parent Company [Member] |  |  |  |
Consolidated Balance Sheet Statements Captions [Line Items] |  |  |  |
Treasury stock,shares | 20,634,265 | 46,301,000 |  |
Parent Company [Member] | Class A Ordinary Shares [Member] |  |  |  |
Consolidated Balance Sheet Statements Captions [Line Items] |  |  |  |
Ordinary stock, par value | $ 0.00001 | $ 0.00001 |  |
Ordinary stock, authorized | 10,000,000,000 | 10,000,000,000 |  |
Ordinary stock, shares issued | 964,071,169 | 874,071,169 |  |
Ordinary Stock, shares outstanding | 943,436,904 | 827,770,169 |  |
Parent Company [Member] | Class B Ordinary Shares [Member] |  |  |  |
Consolidated Balance Sheet Statements Captions [Line Items] |  |  |  |
Ordinary stock, par value | $ 0.00001 | $ 0.00001 |  |
Ordinary stock, authorized | 10,000,000,000 | 10,000,000,000 |  |
Ordinary stock, shares issued | 586,000,000 | 659,000,000 |  |
Ordinary Stock, shares outstanding | 586,000,000 | 659,000,000 |  |

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