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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (loss) (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Class of Stock [Line Items]        
Balance at the beginning of the period ¥ 228,145   ¥ 119,116 ¥ 2,201
Other comprehensive income before reclassification (148,737)   133,691 125,244
Amounts reclassified from accumulated other comprehensive income     (21,666) (6,814)
Other comprehensive loss attribute to noncontrolling interests 4,798   (2,996) (1,515)
Balance at the end of the period 84,206 $ 12,943 228,145 119,116
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]        
Class of Stock [Line Items]        
Balance at the beginning of the period 227,728   98,274 (15,726)
Other comprehensive income before reclassification (148,304)   132,450 115,515
Other comprehensive loss attribute to noncontrolling interests 4,798   (2,996) (1,515)
Balance at the end of the period 84,222 12,945 227,728 98,274
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]        
Class of Stock [Line Items]        
Balance at the beginning of the period 417   20,842 17,927
Other comprehensive income before reclassification (433)   1,241 9,729
Amounts reclassified from accumulated other comprehensive income     (21,666) (6,814)
Balance at the end of the period ¥ (16) $ (2) ¥ 417 ¥ 20,842