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Investment in Joint Ventures - Summarized Financial Information of Joint Ventures and Reconciliation with Carrying Amount of Investment in Consolidated Financial Statements (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2014 CNY (¥)
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Non-current assets | ¥ 5,006,080 |  | ¥ 5,298,563 |  | $ 790,925 |  |
Cash and bank balances | 5,390,324 |  | 3,653,914 | ¥ 3,474,364 | 851,633 | $ 577,292 | ¥ 2,291,345
Others | 48,547 |  | 35,559 |  | 7,670 |  |
Total assets | 21,015,059 |  | 18,596,506 |  | 3,320,229 |  |
Non-current liabilities | (630,579) |  | (584,820) |  | (99,627) |  |
Others | (33) |  | (178) |  | (5) |  |
Total liabilities | (10,035,783) |  | (8,610,694) |  | (1,585,582) |  |
Equity | 10,979,276 |  | 9,985,812 | 9,430,069 | 1,734,647 |  | ¥ 9,151,814
Investment in joint ventures | 196,102 |  | 176,351 |  | 30,983 |  |
Revenue | 16,222,442 | $ 2,563,030 | 13,664,840 | 13,733,437 |  |  |
Depreciation and amortization | (444,181) | (70,177) | (478,160) | (469,435) |  |  |
Interest expense | (96,072) | (15,179) | (75,131) | (112,987) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | 1,328,547 | 209,901 | 760,002 | 540,997 |  |  |
Group's share of profit/(loss) for the year, representing the Group's share of total comprehensive income/(loss) for the year | 10,082 | $ 1,593 | (4,068) | ¥ (2,936) |  |  |
Y & C Engine Co., Ltd. [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Non-current assets | 734,270 |  | 616,397 |  |  |  |
Cash and bank balances | 199,925 |  | 99,014 |  |  |  |
Others | 367,293 |  | 215,246 |  |  |  |
Total assets | 1,301,488 |  | 930,657 |  |  |  |
Non-current liabilities | (13,543) |  | (60,382) |  |  |  |
Interest-bearing loans and borrowings | (13,500) |  | (68,800) |  |  |  |
Others | (842,765) |  | (425,777) |  |  |  |
Total liabilities | (869,808) |  | (554,959) |  |  |  |
Equity | ¥ 431,680 |  | ¥ 375,698 |  |  |  |
Proportion of the Group's ownership | 45.00% | 45.00% | 45.00% | 45.00% |  |  |
Group's share of net assets | ¥ 194,256 |  | ¥ 169,064 |  |  |  |
Unrealized profit on transactions with joint venture | (72,021) |  |  |  |  |  |
Investment in joint ventures | 122,235 |  | 169,064 |  | 19,312 |  |
Revenue | 1,331,823 |  | 553,878 | ¥ 356,697 |  |  |
Depreciation and amortization | (20,831) |  | (22,087) | (23,453) |  |  |
Interest expense | (28,663) |  | (14,012) | (19,612) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | ¥ 55,982 |  | ¥ 4,531 | ¥ (19,952) |  |  |
Proportion of the Group's ownership | 45.00% | 45.00% | 45.00% | 45.00% |  |  |
Group's share of profit | ¥ 25,192 |  | ¥ 2,039 | ¥ (8,978) |  |  |
Unrealized profit on transactions with joint venture | (7,437) |  |  |  |  |  |
Group's share of profit/(loss) for the year, representing the Group's share of total comprehensive income/(loss) for the year | 17,755 | $ 2,805 | 2,039 | (8,978) |  |  |
Y & C Engine Co., Ltd. [Member] | Significant Joint Ventures [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Investment in joint ventures | 122,235 |  | 169,064 |  |  |  |
Group's share of profit/(loss) for the year, representing the Group's share of total comprehensive income/(loss) for the year | 17,755 |  | ¥ 2,039 | ¥ (8,978) |  |  |
Copthorne Hotel Qingdao Co Ltd [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Proportion of the Group's ownership |  |  | 60.00% | 60.00% |  |  |
Revenue |  |  | ¥ 3,674 | ¥ 50,971 |  |  |
Depreciation and amortization |  |  | (2,797) | (12,079) |  |  |
Interest expense |  |  | (1,337) | (8,599) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year |  |  | ¥ (6,664) | ¥ (20,311) |  |  |
Proportion of the Group's ownership |  |  | 60.00% | 60.00% |  |  |
Group's share of profit |  |  | ¥ (3,998) | ¥ (12,187) |  |  |
Depreciation arising from fair value adjustment during purchase price allocation |  |  | (467) | (2,804) |  |  |
Reversal of cumulative impairment loss |  |  |  | 21,932 |  |  |
Group's share of profit/(loss) for the year, representing the Group's share of total comprehensive income/(loss) for the year |  |  | (4,465) | 6,941 |  |  |
Copthorne Hotel Qingdao Co Ltd [Member] | Significant Joint Ventures [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Group's share of profit/(loss) for the year, representing the Group's share of total comprehensive income/(loss) for the year |  |  | (4,465) | 6,941 |  |  |
Joint Ventures [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Non-current assets | 766,285 |  | 616,397 |  | 121,068 |  |
Cash and bank balances | 312,980 |  | 99,014 |  | 49,449 |  |
Others | 390,068 |  | 215,246 |  | 61,628 |  |
Total assets | 1,469,333 |  | 930,657 |  | 232,144 |  |
Non-current liabilities | (13,543) |  | (60,382) |  | (2,140) |  |
Interest-bearing loans and borrowings | (13,500) |  | (68,800) |  | (2,133) |  |
Others | (877,585) |  | (425,777) |  | (138,652) |  |
Total liabilities | (904,628) |  | (554,959) |  | (142,925) |  |
Equity | 564,705 |  | 375,698 |  | 89,219 |  |
Investment in joint ventures | 196,102 |  | 176,351 |  | 30,983 |  |
Revenue | 1,331,823 | 210,419 | 557,552 | 407,668 |  |  |
Depreciation and amortization | (21,058) | (3,327) | (24,884) | (35,532) |  |  |
Interest expense | (29,006) | (4,583) | (15,349) | (28,211) |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | 39,009 | 6,163 | (2,133) | (40,263) |  |  |
Group's share of profit/(loss) for the year, representing the Group's share of total comprehensive income/(loss) for the year | 10,082 | 1,593 | (4,068) | (2,936) |  |  |
Joint Ventures [Member] | Significant Joint Ventures [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Investment in joint ventures | 188,748 |  | 169,064 |  | 29,821 |  |
Group's share of profit/(loss) for the year, representing the Group's share of total comprehensive income/(loss) for the year | 9,268 | 1,464 | (2,426) | (2,037) |  |  |
Joint Ventures [Member] | Other Joint Ventures [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Investment in joint ventures | 7,354 |  | 7,287 |  | 1,162 |  |
Group's share of profit/(loss) for the year, representing the Group's share of total comprehensive income/(loss) for the year | 814 | $ 129 | ¥ (1,642) | ¥ (899) |  |  |
MTU Yuchai Power Co., Ltd [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Non-current assets | 32,015 |  |  |  |  |  |
Cash and bank balances | 113,055 |  |  |  |  |  |
Others | 22,775 |  |  |  |  |  |
Total assets | 167,845 |  |  |  |  |  |
Others | (34,820) |  |  |  |  |  |
Total liabilities | (34,820) |  |  |  |  |  |
Equity | ¥ 133,025 |  |  |  |  |  |
Proportion of the Group's ownership | 50.00% | 50.00% |  |  |  |  |
Group's share of net assets | ¥ 66,513 |  |  |  |  |  |
Investment in joint ventures | 66,513 |  |  |  | $ 10,509 |  |
Depreciation and amortization | (227) |  |  |  |  |  |
Interest expense | (343) |  |  |  |  |  |
Profit/(loss) for the year, representing total comprehensive income for the year | ¥ (16,973) |  |  |  |  |  |
Proportion of the Group's ownership | 50.00% | 50.00% |  |  |  |  |
Group's share of profit | ¥ (8,487) |  |  |  |  |  |
Group's share of profit/(loss) for the year, representing the Group's share of total comprehensive income/(loss) for the year | (8,487) | $ (1,341) |  |  |  |  |
MTU Yuchai Power Co., Ltd [Member] | Significant Joint Ventures [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Investment in joint ventures | 66,513 |  |  |  |  |  |
Group's share of profit/(loss) for the year, representing the Group's share of total comprehensive income/(loss) for the year | ¥ (8,487) |  |  |  |  |  |

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