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Accounts Receivable and Credit Losses (Financing Receivables Past Due Prior to Adopting ASC 326) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Institutional Loans, Past Due |  | $ 24,276 | $ 18,800
Institutional Loans, Current |  | 25,749 | 31,415
Total Institutional Loans | $ 47,995 | 50,025 | 50,215
Financing Receivables 1 To 30 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Institutional Loans, Past Due |  | 7,192 | 3,226
Total Institutional Loans | 3,074 |  |
Financing Receivables 31 To 60Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Institutional Loans, Past Due |  | 1,755 | 1,601
Total Institutional Loans | 1,563 |  |
Financing Receivables 61 To 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Institutional Loans, Past Due |  | 1,547 | 566
Total Institutional Loans | 1,187 |  |
Financing Receivables Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Institutional Loans, Past Due |  | $ 13,782 | $ 13,407
Total Institutional Loans | $ 13,735 |  |

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