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Organization and Principal Activities - VIE Arrangements (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Mar. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Variable Interest Entity [Line Items]              
Cash and cash equivalents ¥ 2,317,488 $ 356,191   ¥ 1,411,000 $ 216,867 ¥ 1,843,233 ¥ 1,115,738
Restricted cash 90,149 13,856   167,751      
Short-term investments 1,395,694 214,514   361,499      
Accounts receivable 621,272 95,488   600,885      
Prepayments and other current assets 918,243 141,131   571,306      
Due from related parties 54,052 8,308   44,278      
Deferred tax assets       15,527      
Total current assets 5,396,898 829,488   3,172,246      
Property and equipment, net 89,137 13,700   117,439      
Intangible assets, net 70,225 10,793   227,251      
Goodwill 634,157 97,468 ¥ 939,716 943,922   ¥ 617,863  
Investment in equity investees 149,969 23,050   100,063      
Other long-term investments 1,002,721 154,115   877,094      
Other non-current assets 42,966 6,604   28,310      
Deferred tax assets 57,642 8,859   74,809      
Total non-current assets 2,052,033 315,391   2,368,888      
Total assets 7,448,931 1,144,879   5,541,134      
Accounts payable 164,537 25,289   194,882      
Accrued expenses and other current liabilities 1,532,489 235,539   1,408,419      
Due to related parties 81,810 12,574   71,167      
Income tax payable 50,614 7,779   12,209      
Total current liabilities 2,165,754 332,870   2,066,221      
Other non-current liabilities 54,574 8,388   42,500      
Total non-current liabilities 127,967 19,668   273,735      
Total liabilities 2,293,721 352,538   2,339,956      
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]              
Variable Interest Entity [Line Items]              
Cash and cash equivalents 48,414 7,441   40,485      
Restricted cash 19,374 2,978   3,480      
Short-term investments       26,250      
Accounts receivable 20,807 3,198   18,027      
Prepayments and other current assets 152,508 23,440   147,670      
Due from related parties 276,729 42,532   272,740      
Deferred tax assets       7,324      
Total current assets 517,832 79,589   515,976      
Property and equipment, net 28,560 4,390   45,544      
Intangible assets, net 4,575 703   7,085      
Goodwill 962 148   962      
Investment in equity investees 29,149 4,480   34,740      
Other long-term investments 75,743 11,641   62,565      
Other non-current assets 2,733 420   2,833      
Deferred tax assets 18,397 2,828   11,002      
Total non-current assets 160,119 24,610   164,731      
Total assets 677,951 104,199   680,707      
Accounts payable 23,654 3,636   27,111      
Accrued expenses and other current liabilities 91,097 14,001   105,445      
Due to related parties 407,326 62,605   420,219      
Income tax payable 1,468 226   779      
Total current liabilities 523,545 80,468   553,554      
Other non-current liabilities 4,134 635   1,304      
Total non-current liabilities 4,134 635   1,304      
Total liabilities ¥ 527,679 $ 81,103   ¥ 554,858