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Accounts Receivable and Contract Assets - Summary of aging of past-due accounts receivable (Detail) - CNY (¥) ¥ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | ¥ 860,681 | ¥ 790,130
Accounts receivable | 1,028,004 | 862,586
Loan Facilitation [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 793,608 | 765,354
Accounts receivable | 933,904 | 828,121
Post Facilitation [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 38,710 | 10,310
Accounts receivable | 65,737 | 19,999
Other [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 28,363 | 14,466
Accounts receivable | 28,363 | 14,466
1-89 days past due [member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | 90,365 | 42,965
1-89 days past due [member] | Loan Facilitation [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | 78,878 | 38,768
1-89 days past due [member] | Post Facilitation [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | 11,487 | 4,197
90-119 days past due [member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | 27,014 | 9,882
90-119 days past due [member] | Loan Facilitation [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | 22,058 | 8,193
90-119 days past due [member] | Post Facilitation [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | 4,956 | 1,689
120-149 days past due [member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | 25,678 | 9,963
120-149 days past due [member] | Loan Facilitation [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | 20,440 | 8,086
120-149 days past due [member] | Post Facilitation [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | 5,238 | 1,877
150-179 days past due [member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | 24,266 | 9,646
150-179 days past due [member] | Loan Facilitation [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | 18,920 | 7,720
150-179 days past due [member] | Post Facilitation [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Accounts receivable | ¥ 5,346 | ¥ 1,926

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