Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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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- Definition

Interest rate of interest rate derivative instrument.

+ References

No definition available.

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- Definition

Maturity date of interest rate swap

+ References

No definition available.

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- Definition

Portion of debt instrument face amount.

+ References

No definition available.

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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.

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
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- Definition

Amount of gain (loss) from the ineffectiveness of the hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
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- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

No definition available.

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Debt - Interest Rate Swap - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2011	Jun. 30, 2010	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Hedge ineffectiveness and income statement effect in period			$ 0	$ 0	$ 0
Senior Unsecured Notes Due 2016 [Member]
Debt Instrument [Line Items]
Portion of debt instrument face amount		$ 65,000,000
Senior Unsecured Notes Due 2016 [Member] \| Interest Rate Contract [Member]
Debt Instrument [Line Items]
Fair value of the interest rate swaps				$ 2,900,000
Senior Unsecured Notes Due 2016 [Member] \| Interest Rate Contract One [Member]
Debt Instrument [Line Items]
Interest rate of interest rate derivative instrument		5.507%
Maturity date of interest rate swap				2016-07
Senior Unsecured Notes Due 2016 [Member] \| Interest Rate Contract Two [Member]
Debt Instrument [Line Items]
Maturity date of interest rate swap				2016-07
Interest rate swap, amount fixed	$ 60,000,000
Interest rate of derivative instrument	5.675%