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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of loans under investor assurance program (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)
Current loan products
Guarantor Obligations [Line Items]
Total outstanding loan balances	¥ 1,224,961
Maximum potential undiscounted future payments	¥ 1,265,267
Remaining weighted average contractual term	2 years 3 months 18 days
Net expected accumulative loss rate on outstanding loans	11.30%
Other online standard loan products
Guarantor Obligations [Line Items]
Total outstanding loan balances	¥ 169,072
Maximum potential undiscounted future payments	¥ 180,845
Remaining weighted average contractual term	8 years 9 months 18 days
Net expected accumulative loss rate on outstanding loans	16.00%
Offline and non-standard loan products
Guarantor Obligations [Line Items]
Total outstanding loan balances	¥ 3,554,398
Maximum potential undiscounted future payments	¥ 3,847,072
Remaining weighted average contractual term	10 years 6 months
Net expected accumulative loss rate on outstanding loans	19.00%
Loans related to other guarantee liabilities
Guarantor Obligations [Line Items]
Maximum potential undiscounted future payments	¥ 4,060

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- Definition

Guarantee obligations net expected accumulative loss rate on outstanding loans.

+ References

No definition available.

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248

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+ References

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248

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