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Fair Value Disclosure (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Aggregate purchase price of CMBS | $ 25,477 | $ 33,362
Fair Value, Net Asset (Liability) | 176,611 | 191,448
Level 2 [Member] | AAA Commercial Mortage Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Aggregate purchase price of CMBS | 151,134 | 158,086
Estimated Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Aggregate purchase price of CMBS | 25,477 | 33,362
Fair Value, Net Asset (Liability) | 176,611 | 191,448
Estimated Fair Value [Member] | AAA Commercial Mortage Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Aggregate purchase price of CMBS | $ 151,134 | $ 158,086

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- Definition Fair value of asset after deduction of liability. + References No definition available. + 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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