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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 |  |  |

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