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Correction of errors (Details) - CNY (¥)
¥ / shares in Units, ¥ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]      
General and administrative ¥ (13,280) ¥ (20,368) ¥ (34,895)
Total operating costs and expenses (14,978) (22,162) (38,033)
Income before taxation 58,616 26,188 44,376
Income tax expense 0 (18,033) (15,550)
Net profit ¥ 58,616 ¥ 8,155 28,826
As Previously Reported [Member]      
Statement [Line Items]      
Interest expense (note 30.1)     (38,140)
Total interest expense     (38,814)
General and administrative     (26,720)
Total operating costs and expenses     (29,858)
Income before taxation     48,202
Income tax expense     (14,636)
Net profit     ¥ 33,566
Basic and diluted earnings per share (note 30.5)     ¥ 0.14
Adjustment [Member]      
Statement [Line Items]      
Interest expense (note 30.1)     ¥ 4,349
General and administrative     (8,175)
Total operating costs and expenses     (8,175)
Income before taxation     (3,826)
Income tax expense     (914)
Net profit     ¥ (4,740)
Basic and diluted earnings per share (note 30.5)     ¥ (0.04)
As Currently Reported [Member]      
Statement [Line Items]      
Interest expense (note 30.1)     ¥ (33,791)
General and administrative     (34,895)
Total operating costs and expenses     (38,033)
Income before taxation     44,376
Income tax expense     (15,550)
Net profit     ¥ 28,826
Basic and diluted earnings per share (note 30.5)     ¥ 0.10
Total interest expense     ¥ (34,465)