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Derivative Instruments - Terms of Interest Rate Swaps Underlying Swaption (Detail) - Interest rate swaption agreements [Member] - LIBOR [Member]	12 Months Ended
	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%

X

- 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

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X

- 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

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- Definition

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+ References

No definition available.

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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

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