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Debt Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended |
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Commercial Mortgage Backed Securities [Member] | Dec. 31, 2013 Commercial Mortgage Backed Securities [Member] | Dec. 31, 2012 Commercial Mortgage Backed Securities [Member] | Mar. 31, 2012 Commercial Mortgage Backed Securities [Member] Wells Fargo [Member] | Dec. 31, 2013 Commercial Mortgage Backed Securities [Member] CMBS - UBS [Member] | Jun. 30, 2012 Commercial Mortgage Backed Securities [Member] CMBS - Hilton [Member] | Jun. 30, 2012 Commercial Mortgage Backed Securities [Member] CMBS - Hilton [Member] Wells Fargo [Member]
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities, face amount | $ 188,643 |  |  |  | $ 273,343 |  |  |  | $ 188,643 | $ 273,343 |  |  | $ 33,066 | $ 65,410 |  | $ 133,783 | $ 74,854 |
Aggregate purchase price of CMBS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 133,899 |  |
Payments for available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,655 |
Borrowings to finance Hilton CMBS | 202,033 |  |  |  | 225,158 |  |  |  | 202,033 | 225,158 |  |  |  |  |  |  |  | 49,459
Additional financing for Hilton CMBS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000
Amortized cost | 190,178 |  |  |  | 273,713 |  |  |  | 190,178 | 273,713 |  | 137,423 | 34,232 | 67,109 |  |  |  |
Realized gains, net | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 262 | 0 | 262 | 0 | 262 |  |  |  |  |  |
Realized gains, gross |  |  |  |  |  |  |  |  |  |  |  | 345 |  |  |  |  |  |
Realized gains, loss |  |  |  |  |  |  |  |  |  |  |  | 83 |  |  |  |  |  |
Sale generated proceeds of borrowings |  |  |  |  |  |  |  |  |  |  |  | 14,621 |  |  |  |  |  |
Sale generated proceeds after repayment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 123,064 |  |  |

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- Definition Available-for-sale Debt Securities, Face Amount + References No definition available. + Details
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- Definition Proceeds from Sale of Available-for-sale Securities, Debt, Net of Repayment of Line of Credit + 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&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=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss 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=27724398&loc=d3e27357-111563 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Mortgage-Backed Securities -URI http://asc.fasb.org/extlink&oid=6517959 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: 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 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: 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=31042434&loc=d3e3291-108585 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 + Details
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