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Additional Information - Condensed Financial Statements of the Company (Statements of Cash Flows) (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Cash flows from operating activities:        
Net cash provided by/(used in) operating activities ¥ 203,686 $ 29,337 ¥ 220,812 ¥ 273,474
Cash flows from investing activities:        
Placement of term deposits and short term investments (3,199,923) (460,885) (3,288,344) (3,565,274)
Maturity of term deposits and short term investments 3,189,803 459,427 2,562,584 4,082,583
Investments in available-for-sale investments 0 0 (352,008) (36,810)
Issuance of convertible loans to a related party (228,280) (32,879) 0 0
Loans provided to a related party (45,865) (6,606) 0 0
Net cash used in investing activities (543,149) (78,230) (1,256,868) 393,172
Cash flows from financing activities:        
Proceeds from exercise of stock options 2,436 351 6,944 8,756
Repurchase of ordinary shares 0 0 (66,417) (242,500)
Net cash (used in)/provided by financing activities 217,148 31,276 64,366 (223,744)
Net (decrease)/increase in cash and cash equivalents (107,975) (15,552) (975,178) 440,709
Cash and cash equivalents at the beginning of the year 310,669 44,746 1,285,847 845,138
Cash and cash equivalents at the end of the year 202,694 29,194 310,669 1,285,847
Parent Company [Member]        
Cash flows from operating activities:        
Net cash provided by/(used in) operating activities (2,323) (335) (8,754) 27,590
Cash flows from investing activities:        
Placement of term deposits and short term investments 0 0 (83,854) (335,493)
Maturity of term deposits and short term investments 83,854 12,077 0 386,427
Investments in available-for-sale investments 0 0 (352,008) (36,810)
Issuance of convertible loans to a related party (228,280) (32,879) 0 0
Loans provided to a related party (45,865) (6,606) 0 0
Investments in investments using equity accounting (3,554) (512) (35,757) (69,365)
Net cash used in investing activities (193,845) (27,920) (471,619) (55,241)
Cash flows from financing activities:        
Borrowings from subsidiaries and VIEs 212,441 30,598 212,435 13,867
Proceeds from exercise of stock options 2,436 351 6,944 8,756
Repurchase of ordinary shares 0 0 (66,417) (242,500)
Net cash (used in)/provided by financing activities 214,877 30,949 152,962 (219,877)
Net (decrease)/increase in cash and cash equivalents 18,709 2,694 (327,411) (247,528)
Cash and cash equivalents at the beginning of the year 14,022 2,020 341,433 588,961
Cash and cash equivalents at the end of the year ¥ 32,731 $ 4,714 ¥ 14,022 ¥ 341,433