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Condensed Financial Information of the Parent Company - Schedule of Cash Flow Statement (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities ¥ (215,522) $ (30,958) ¥ 1,884,956 ¥ 3,409,451
Net cash used in investing activities (828,219) (118,966) (1,447,013) (2,450,800)
Net cash provided by (used in) financing activities 1,749,512 251,301 530,097 2,132,933
Cash, cash equivalents and restricted cash-beginning of year 1,616,164      
Cash, cash equivalents and restricted cash-end of year 2,324,542 333,900 1,616,164  
Parent Company [Member]        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by (used in) operating activities 8,474 1,217 12,111 (12,178)
Net cash used in investing activities 86,471 12,421 (69,660) (720,259)
Net cash provided by (used in) financing activities (401,400) (57,658) (438,253) 1,677,222
Effect of exchange rate changes on cash, cash equivalents and restricted cash 2,544 366 22,098 (13,447)
Net increase (decrease) in cash, cash equivalents and restricted cash (303,911) (43,654) (473,704) 931,338
Cash, cash equivalents and restricted cash-beginning of year 461,054 66,226 934,758 3,420
Cash, cash equivalents and restricted cash-end of year ¥ 157,143 $ 22,572 ¥ 461,054 ¥ 934,758