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Condensed Financial Information of the Company - Condensed Balance Sheets (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 (¥)
--- | --- | --- | --- | --- | --- | --- | ---
Current assets |  |  |  |  |  |  |
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 |  |  |
Prepayments and other current assets | 918,243 | 141,131 |  | 571,306 |  |  |
Due from related parties | 54,052 | 8,308 |  | 44,278 |  |  |
Total current assets | 5,396,898 | 829,488 |  | 3,172,246 |  |  |
Non-current assets |  |  |  |  |  |  |
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 investment | 1,002,721 | 154,115 |  | 877,094 |  |  |
Investment in subsidiaries | 1,152,690 | 177,165 |  | 977,157 |  |  |
Total non-current assets | 2,052,033 | 315,391 |  | 2,368,888 |  |  |
Total assets | 7,448,931 | 1,144,879 |  | 5,541,134 |  |  |
Current liabilities |  |  |  |  |  |  |
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 |  |  |
Non-current liabilities |  |  |  |  |  |  |
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 |  |  |
Shareholders' equity |  |  |  |  |  |  |
Treasury stock (25,368,080 and nil shares as of December 31, 2016 and 2017, respectively) |  |  |  | (178,991) |  |  |
Additional paid-in capital | 2,644,043 | 406,382 |  | 2,725,675 |  |  |
Retained earnings | 1,564,883 | 240,518 |  | 237,293 |  |  |
Accumulated other comprehensive income | 84,206 | 12,943 |  | 228,145 |  | 119,116 | 2,201
Total shareholders' equity | 4,293,361 | 659,878 |  | 3,012,352 |  |  |
Total liabilities and shareholders' equity | 7,448,931 | 1,144,879 |  | 5,541,134 |  |  |
Common Class A [Member] |  |  |  |  |  |  |
Shareholders' equity |  |  |  |  |  |  |
Ordinary shares | 65 | 10 |  | 65 |  |  |
Common Class B [Member] |  |  |  |  |  |  |
Shareholders' equity |  |  |  |  |  |  |
Ordinary shares | 164 | 25 |  | 165 |  |  |
Parent Company [Member] |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |
Cash and cash equivalents | 373,484 | 57,403 |  | 74,488 | $ 11,448 | ¥ 583,374 | ¥ 534,390
Restricted cash | 65,342 | 10,043 |  | 69,370 |  |  |
Short-term investments | 196,026 | 30,129 |  | 316 |  |  |
Prepayments and other current assets | 97,120 | 14,927 |  | 33,564 |  |  |
Due from related parties | 2,131,927 | 327,671 |  | 2,619,793 |  |  |
Total current assets | 2,863,899 | 440,173 |  | 2,797,531 |  |  |
Non-current assets |  |  |  |  |  |  |
Intangible assets, net | 2,587 | 398 |  | 9,846 |  |  |
Goodwill | 59,775 | 9,187 |  | 63,460 |  |  |
Investment in equity investees | 5,317 | 817 |  | 5,814 |  |  |
Other long-term investment | 326,710 | 50,214 |  |  |  |  |
Investment in subsidiaries | 2,295,956 | 352,882 |  | 864,120 |  |  |
Total non-current assets | 2,690,345 | 413,498 |  | 943,240 |  |  |
Total assets | 5,554,244 | 853,671 |  | 3,740,771 |  |  |
Current liabilities |  |  |  |  |  |  |
Bank loans | 326,710 | 50,214 |  | 346,850 |  |  |
Accounts payable |  |  |  | 32 |  |  |
Accrued expenses and other current liabilities | 11,709 | 1,800 |  | 24,101 |  |  |
Due to related parties | 919,431 | 141,314 |  | 356,898 |  |  |
Income tax payable | 2,772 | 426 |  | 344 |  |  |
Total current liabilities | 1,260,622 | 193,754 |  | 728,225 |  |  |
Non-current liabilities |  |  |  |  |  |  |
Other non-current liabilities | 261 | 39 |  | 194 |  |  |
Total non-current liabilities | 261 | 39 |  | 194 |  |  |
Total liabilities | 1,260,883 | 193,793 |  | 728,419 |  |  |
Shareholders' equity |  |  |  |  |  |  |
Treasury stock (25,368,080 and nil shares as of December 31, 2016 and 2017, respectively) |  |  |  | (178,991) |  |  |
Additional paid-in capital | 2,644,043 | 406,382 |  | 2,725,675 |  |  |
Retained earnings | 1,564,883 | 240,518 |  | 237,293 |  |  |
Accumulated other comprehensive income | 84,206 | 12,943 |  | 228,145 |  |  |
Total shareholders' equity | 4,293,361 | 659,878 |  | 3,012,352 |  |  |
Total liabilities and shareholders' equity | 5,554,244 | 853,671 |  | 3,740,771 |  |  |
Parent Company [Member] | Common Class A [Member] |  |  |  |  |  |  |
Shareholders' equity |  |  |  |  |  |  |
Ordinary shares | 65 | 10 |  | 65 |  |  |
Parent Company [Member] | Common Class B [Member] |  |  |  |  |  |  |
Shareholders' equity |  |  |  |  |  |  |
Ordinary shares | ¥ 164 | $ 25 |  | ¥ 165 |  |  |

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