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Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
LIBOR period	3 months
Weighted average fixed rate	6.14%
Recorded period of effectiveness of cash flow hedges on net income	12 months
Recorded period of effectiveness of fair value hedges on net income	12 months
Recorded period of effectiveness of fair value of derivatives on net income	12 months
Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount of interest	$ 30.5	$ 30.5
Derivative in Fair Value Hedging Relationship [Member]
Derivative [Line Items]
Notional amount of interest	$ 118.1	$ 117.3

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- Definition

Cash flow hedge derivatives expected period of insignificant impact on net income.

+ References

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- Definition

Fair flow hedge derivatives expected period of insignificant impact on net income.

+ References

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- Definition

LIBOR period.

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- Definition

Non designated hedge derivatives expected period of insignificant impact on net income.

+ References

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- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

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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.

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