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Basis of preparation and accounting policies - Impact on statement of profit or loss (increase/(decrease) (Detail)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2018
CNY (¥)
¥ / shares
Dec. 31, 2017
CNY (¥)
¥ / shares
Dec. 31, 2016
CNY (¥)
¥ / shares
Dec. 31, 2018
CNY (¥)
Jan. 01, 2017
CNY (¥)
Dec. 31, 2015
CNY (¥)
 [1]
Disclosure of initial application of standards or interpretations [line items]              
Revenue from contracts with customers $ 2,430,942 ¥ 16,263,248 ¥ 16,197,819 ¥ 13,643,195      
Cost of sales (1,968,764) (13,171,227) (12,841,768) [1] (10,670,743) [1]      
Gross profit 462,178 3,092,021 3,356,051 [1] 2,972,452 [1]      
Other income 30,663 205,143 532,117 [1] 117,954 [1]      
Selling, general and administrative cost (232,360) (1,554,512) (1,652,855) [1] (1,500,273) [1]      
Operating profit 191,703 1,282,521 1,604,413 [1] 979,527 [1]      
Income tax expense (30,891) (206,667) (194,172) [1] (160,270) [1]      
Profit for the year 145,647 974,400 1,319,856 [1] 735,962 [1]      
Attributable to:              
Equity holders of the parent 103,925 695,266 888,809 [1] 525,177 [1]      
Non-controlling interests $ 41,722 ¥ 279,134 ¥ 431,047 [1] ¥ 210,785 [1]      
Earnings per share              
Basic | (per share) $ 2.54 ¥ 17.02 ¥ 21.80 [1] ¥ 13.12 [1]      
Diluted | (per share) $ 2.54 ¥ 17.02 ¥ 21.80 [1] ¥ 13.12 [1]      
Assets              
Intangible asset $ 30,792   ¥ 10,122 [1] ¥ 50,122 ¥ 206,001 ¥ 50,122 [1]  
Investments in associate and joint venture 33,623   198,287 [1]   224,942 107,126 [1]  
Deferred tax assets 53,991   315,390 [1]   361,207 282,212 [1]  
Non-current assets 782,810   5,006,080 [1]   5,237,073 5,167,803 [1]  
Trade and other receivables 1,104,483   7,031,544   7,389,106    
Total current assets 2,454,505   16,008,979 [1]   16,420,891 13,347,943 [1]  
Total assets 3,237,315   21,015,059 [1]   21,657,964 18,515,746 [1]  
Equity and liabilities              
Contract liabilities 8,027   34,759 [1]   53,703 27,372 [1]  
Total non-current liabilities 142,174   665,338 [1]   951,160 612,192 [1]  
Trade and other payables 1,050,963   7,350,684 [1]   7,031,043 6,552,999 [1]  
Contract liabilities 42,867   198,570 [1]   286,786 185,914 [1]  
Provision for product warranty 24,949   191,814 [1]   166,913 169,006 [1]  
Current liabilities 1,428,865   9,387,817 [1]   9,559,250 7,849,900 [1]  
Total liabilities 1,571,039   10,053,155 [1]   10,510,410 8,462,092 [1]  
Equity              
Retained earnings 910,681   5,996,120 [1]   6,092,549 5,358,037 [1]  
Non-controlling interests 411,310   2,627,617 [1]   2,751,705 2,317,982 [1]  
Total equity 1,666,276   10,961,904 [1] 10,053,654 [1] 11,147,554 10,053,654 [1] ¥ 9,485,557
Total equity and liabilities 3,237,315   21,015,059 [1]   ¥ 21,657,964 18,515,746 [1]  
Profit before tax 176,538 ¥ 1,181,067 1,514,028 [1] 896,232 [1]      
Adjustments:              
Profit before tax after adjustments 230,345 1,541,047 1,592,906 [1] 1,382,483 [1]      
Changes in working capital              
Increase in trade and other payables and contract liabilities (34,298) (229,457) 846,175 [1] 849,134 [1]      
Cash flows from operating activities 128,734 861,259 1,623,142 [1] 2,409,108 [1]      
Net cash flows from operating activities 100,235 670,601 1,420,167 [1] 2,276,087 [1]      
Investing activities              
Net cash flows from investing activities $ (11,956) ¥ (79,992) 76,570 [1] (572,031) [1]      
Increase (decrease) due to application of IFRS 15 [member]              
Disclosure of initial application of standards or interpretations [line items]              
Revenue from contracts with customers     (24,623) (21,645)      
Cost of sales     134,349 (29,912)      
Gross profit     (158,972) 8,267      
Other income     (115,235)        
Selling, general and administrative cost     (162,998) (4,087)      
Operating profit     (111,209) 12,354      
Income tax expense     (25,995)        
Profit for the year     (85,214) 12,354      
Attributable to:              
Equity holders of the parent     (65,113) 9,440      
Non-controlling interests     ¥ (20,101) ¥ 2,914      
Earnings per share              
Basic | ¥ / shares     ¥ (1.60) ¥ 0.23      
Diluted | ¥ / shares     ¥ (1.60) ¥ 0.23      
Assets              
Intangible asset       ¥ (31,704)      
Investments in associate and joint venture       (73,061)      
Deferred tax assets       (25,995)      
Non-current assets       (130,760)      
Trade and other receivables       50,000      
Total current assets       50,000      
Total assets       (80,760)      
Equity and liabilities              
Contract liabilities     ¥ 34,759 27,372   27,400  
Total non-current liabilities     34,759 27,372      
Trade and other payables       (170,000)      
Contract liabilities     81,105 63,870   ¥ 63,900  
Provision for product warranty     (98,492) (69,844)      
Current liabilities     (17,387) (175,974)      
Total liabilities     17,372 (148,602)      
Equity              
Retained earnings     (13,275) 51,838      
Non-controlling interests     (4,097) 16,004      
Total equity     (17,372) 67,842      
Total equity and liabilities       (80,760)      
Profit before tax     (111,209) 12,354      
Adjustments:              
Gain on disposal of intangible asset     115,235        
Profit before tax after adjustments     4,026 12,354      
Changes in working capital              
Decrease in trade and other receivables     50,000        
Increase in trade and other payables and contract liabilities     (4,026) ¥ (12,354)      
Cash flows from operating activities     50,000        
Net cash flows from operating activities     50,000        
Investing activities              
Proceeds from disposal of intangible asset     (50,000)        
Net cash flows from investing activities     ¥ (50,000)        
[1] Restated