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Derivative Instruments - Terms of Interest Rate Swaps Underlying Swaption (Detail) - Interest rate swaption agreements [Member] - LIBOR [Member] | 12 Months Ended
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Dec. 31, 2015 USD ($)
Call Option [Member] | April 28, 2017 [Member] |
Derivative [Line Items] |
Principal amount | $ 155,000,000
Option Exercise Date | Apr. 28, 2017
Fair Value / Carrying Amount of Assets (Liability) | $ 686,000
Remaining Term (Years) | 7 years 6 months
Fixed Interest Rate | 3.34%
Call Option [Member] | January 31, 2018 [Member] |
Derivative [Line Items] |
Principal amount | $ 160,000,000
Option Exercise Date | Jan. 31, 2018
Fair Value / Carrying Amount of Assets (Liability) | $ 1,956,000
Remaining Term (Years) | 8 years
Fixed Interest Rate | 3.10%
Call Option [Member] | July 16, 2018 [Member] |
Derivative [Line Items] |
Principal amount | $ 160,000,000
Option Exercise Date | Jul. 16, 2018
Fair Value / Carrying Amount of Assets (Liability) | $ 2,981,000
Remaining Term (Years) | 8 years
Fixed Interest Rate | 2.94%
Put Option [Member] | April 28, 2017 [Member] |
Derivative [Line Items] |
Principal amount | $ 155,000,000
Option Exercise Date | Apr. 28, 2017
Fair Value / Carrying Amount of Assets (Liability) | $ (2,626,000)
Remaining Term (Years) | 7 years 6 months
Fixed Interest Rate | 2.15%
Put Option [Member] | January 31, 2018 [Member] |
Derivative [Line Items] |
Principal amount | $ 160,000,000
Option Exercise Date | Jan. 31, 2018
Fair Value / Carrying Amount of Assets (Liability) | $ (2,041,000)
Remaining Term (Years) | 8 years
Fixed Interest Rate | 1.97%
Put Option [Member] | July 16, 2018 [Member] |
Derivative [Line Items] |
Principal amount | $ 160,000,000
Option Exercise Date | Jul. 16, 2018
Fair Value / Carrying Amount of Assets (Liability) | $ (1,739,000)
Remaining Term (Years) | 8 years
Fixed Interest Rate | 1.83%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Line items represent financial 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 No definition available. + Details
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- Definition Fair value as of the balance sheet date of all derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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