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Debt Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended |  | 3 Months Ended | 1 Months Ended |  |  |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended |  |
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Mar. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2011 | Jun. 30, 2012 CMBS - Hilton (Fair Value Option) [Member] | Mar. 31, 2012 Commercial Mortgage Backed Securities [Member] | Nov. 12, 2014 Subsequent Event [Member] | Nov. 12, 2013 Subsequent Event [Member] | Nov. 12, 2012 Subsequent Event [Member] | Jun. 30, 2012 Beginning Balance of Wells Facility Borrowings [Member] CMBS - Hilton (Fair Value Option) [Member] | Jun. 30, 2012 Beginning Balance of Wells Facility Borrowings [Member] CMBS - Hilton (Fair Value Option) [Member] | Dec. 31, 2012 AAA-Rated CMBS [Member] | Mar. 31, 2012 Wells Facility borrowings [Member] | Dec. 31, 2012 Wells Facility borrowings [Member] | Aug. 31, 2010 Wells Facility borrowings [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value of CBMS acquired |  | $ 74,854 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument description |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of CMBS |  |  | 1.75% |  |  |  |  |  | 3.80% | 3.30% | 2.30% |  |  |  |  | 2.35% | 0.25%
Percentage of Debt Yield |  |  |  |  |  | 5.60% |  |  |  |  |  |  |  |  |  |  |
Purchase value of Hilton CMBS |  |  |  |  |  |  | 70,655 |  |  |  |  |  |  |  |  |  |
Borrowings for purchase of Hilton CMBS |  |  |  |  |  |  |  |  |  |  |  |  | 49,459 |  |  |  |
Additional financing for Hilton CMBS |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |
Amortized cost |  |  |  |  |  |  |  | 137,423 |  |  |  |  |  |  |  |  |
Realized gains, net | 262 |  | 262 |  | (33) |  |  | 262 |  |  |  |  |  |  |  |  |
Realized gains, gross |  |  |  |  |  |  |  | 345 |  |  |  |  |  |  |  |  |
Realized gains, loss |  |  |  |  |  |  |  | 83 |  |  |  |  |  |  |  |  |
Sale generated proceeds of borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,621 |  |
Sale generated proceeds after repayment |  |  | 251,327 | 46,007 | 9,241 |  |  |  |  |  |  |  |  |  | 123,064 |  |
Aggregate face value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 273,343 |  |  |

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- Definition Borrowings to finance mortgage backed securities. + References No definition available. + Details
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- Definition Payments to acquire mortgage backed securities. + References No definition available. + Details
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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 No definition available. + Details
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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash inflow associated with the sale of debt securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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