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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 03, 2014
Significant Accounting Policies [Line Items] |  |  |  |
Short-term investment | ¥ 1,937,000 | ¥ 945,000 | ¥ 622,800 |
Investment income | 12,676 | 5,961 | 4,652 |
Advertising costs | 201,298 | 151,533 | 102,820 |
Government grants | 3,199 | 5,851 | 9,916 |
Contributions to employee benefits | 85,325 | 69,370 | ¥ 51,510 |
Deferred offering costs |  |  |  | ¥ 3,788
PRC [Member] | RMB Denominated Bank Deposits [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash, cash equivalents, time deposits and restricted time deposits | 867,811 | 627,148 |  |
PRC [Member] | US Dollar Denominated Bank Deposits [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash, cash equivalents, time deposits and restricted time deposits | 152,792 | 52,680 |  |
HK SAR [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash, cash equivalents, time deposits and restricted time deposits | 3,535 | 645 |  |
HK SAR [Member] | RMB Denominated Bank Deposits [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash, cash equivalents, time deposits and restricted time deposits | 3 | 3 |  |
HK SAR [Member] | HK Dollar Denominated Bank Deposits [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash, cash equivalents, time deposits and restricted time deposits | 1 | 99 |  |
US [Member] | RMB Denominated Bank Deposits [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash, cash equivalents, time deposits and restricted time deposits | 0 | 547,388 |  |
US [Member] | US Dollar Denominated Bank Deposits [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash, cash equivalents, time deposits and restricted time deposits | ¥ 261,913 | ¥ 55 |  |
Office buildings [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life | 45 years |  |  |
Furniture [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life | 5 years |  |  |
Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Operating lease term | 1 year |  |  |
Contributions to employee benefits, percentage of salary | 22.30% |  |  |
Loan Referral Service Revenue, Percentage | 5.00% |  |  |
Minimum [Member] | Office equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life | 3 years |  |  |
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Operating lease term | 10 years |  |  |
Contributions to employee benefits, percentage of salary | 53.10% |  |  |
Loan Referral Service Revenue, Percentage | 8.00% |  |  |
Maximum [Member] | Office equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life | 4 years |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates as well as short term and long term restricted investments, such as time deposits. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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