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Condensed Statements of Cash Flows (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash used in operating activities $ 61,835 ¥ 402,310 ¥ 83,620 ¥ 216,834
Net cash used in investing activities (107,486) (699,336) (841,017) (370,130)
Net cash generated from financing activities 167,459 1,089,537 209,472 1,115,032
Net increase(decrease) in cash and cash equivalents 100,244 652,213 (387,636) 1,040,639
Cash and cash equivalents at beginning of year 199,409 1,297,418 1,685,054 644,415
Cash and cash equivalents at end of year 299,653 1,949,631 1,297,418 1,685,054
Parent Company        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash used in operating activities (2,816) (18,324) (78,567) (26,621)
Net cash used in investing activities (198,430) (1,291,042) (617,613) (977,300)
Net cash generated from financing activities 239,480 1,558,127 494,851 1,798,230
Net increase(decrease) in cash and cash equivalents 38,234 248,761 (201,329) 794,309
Cash and cash equivalents at beginning of year 91,737 596,871 798,200 3,891
Cash and cash equivalents at end of year $ 129,971 ¥ 845,632 ¥ 596,871 ¥ 798,200