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Debt Securities - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2015 USD ($) | Aug. 31, 2014 USD ($) option | May. 31, 2014 USD ($) ft² room casino timeshare_unit | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2014 USD ($)
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Realized gain (loss) on sale of securities |  |  |  | $ 0 | $ (443) |  |
Subordinate Mortgage Loans [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage loan, face amount |  |  |  | $ 966,164 |  | $ 964,955 |
Hotel [Member] | Subordinate Mortgage Loans [Member] | Hotel - Aruba [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Property Size, Number of Units/Rooms | room |  |  | 442 |  |  |  |
Number of timeshare units in real estate property | timeshare_unit |  |  | 114 |  |  |  |
Number of casinos in real estate property | casino |  |  | 2 |  |  |  |
Property Size, Area (in square feet) | ft² |  |  | 131,500 |  |  |  |
Term of loan |  | 3 years |  |  |  |  |
Number of options to extend loan agreement | option |  | 2 |  |  |  |  |
Option to extend loan agreement, term |  | 1 year |  |  |  |  |
Appraised loan to value ratio |  | 60.00% |  |  |  |  |
First Mortgage [Member] | Hotel [Member] | Subordinate Mortgage Loans [Member] | Hotel - Aruba [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Mortgage loan, face amount |  |  | $ 155,000 |  |  |  |
Senior Participation [Member] | Hotel [Member] | Subordinate Mortgage Loans [Member] | Hotel - Aruba [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Participation in loan, amount |  | $ 90,000 |  |  |  |  | $ 90,000
Junior Participation [Member] | Hotel [Member] | Subordinate Mortgage Loans [Member] | Hotel - Aruba [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Participation in loan, amount |  | $ 65,000 |  |  |  |  | $ 65,000
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Amortized cost of debt securities sold | $ 24,038 |  |  |  |  |  |
Realized gain on sale of debt securities | 43 |  |  |  |  |  |
Realized loss on sale of debt securities | 486 |  |  |  |  |  |
Reclassification out of accumulated other comprehensive income | 678 |  |  |  |  |  |
Proceeds from sale of debt securities, net of debt facility repayment | 1,341 |  |  |  |  |  |
Line of Credit [Member] | Wells Fargo [Member] |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Repayment of debt facility | $ 22,254 |  |  |  |  |  |

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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