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Investments - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Sep. 08, 2017
Investment [Line Items] |  |  |  |  |  |
Equity Income |  |  | $ 4,750 | $ 5,019 |  |
Equity method investments | $ 106,010 |  | 106,010 |  | $ 101,275 |
Other Assets [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Equity method investments | 106,000 |  | 106,000 |  | 101,300 |
Alternative investment | $ 57,500 |  | $ 57,500 |  | $ 53,500 |
CF Real Estate Finance Holdings, L.P. [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 100,000
Equity method investment ownership percentage | 27.00% |  | 27.00% |  |  |
Other Income/(Loss), Net [Member] |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Equity Income | $ 4,800 | $ 1,800 | $ 4,800 | $ 5,000 |  |
Gains or losses relating to investments | $ 3,900 |  | $ 3,900 |  |  |

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- Definition Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=99392525&loc=SL7495116-110257 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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