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Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Restricted cash | $ 57,665 | $ 62,457 | $ 67,438
Securities, held-to-maturity | 0 | 146,352 |
Level 1 [Member] | Carrying Value [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Cash and cash equivalents | 214,016 | 200,996 |
Restricted cash | 57,665 | 62,457 |
Convertible senior notes, net | (250,949) | (249,994) |
Level 1 [Member] | Estimated Fair Value [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Cash and cash equivalents | 214,016 | 200,996 |
Restricted cash | 57,665 | 62,457 |
Convertible senior notes, net | (274,262) | (268,124) |
Level 3 [Member] | Carrying Value [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Securities, held-to-maturity | 0 | 146,352 |
Borrowings under repurchase agreements | (1,340,254) | (1,146,566) |
Level 3 [Member] | Carrying Value [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial mortgage and subordinate loans | 2,037,971 | 1,641,856 |
Level 3 [Member] | Carrying Value [Member] | Subordinate Mortgage Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial mortgage and subordinate loans | 1,240,363 | 1,051,236 |
Level 3 [Member] | Estimated Fair Value [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Securities, held-to-maturity | 0 | 146,352 |
Borrowings under repurchase agreements | (1,338,368) | (1,146,807) |
Level 3 [Member] | Estimated Fair Value [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial mortgage and subordinate loans | 2,034,082 | 1,648,896 |
Level 3 [Member] | Estimated Fair Value [Member] | Subordinate Mortgage Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial mortgage and subordinate loans | 1,244,548 | 1,060,882 |
Level 3 [Member] | Participating Mortgages [Member] | Carrying Value [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Participations sold | 0 | (84,979) |
Level 3 [Member] | Participating Mortgages [Member] | Estimated Fair Value [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Participations sold | $ 0 | $ (85,072) |

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- Definition Fair value portion 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. + References No definition available. + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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