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Derivative Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Cash Flow Hedging [Member]	Sep. 30, 2013 Derivative in Fair Value Hedging Relationship [Member]	Dec. 31, 2012 Derivative in Fair Value Hedging Relationship [Member]
Derivative [Line Items]
LIBOR period	3 months
Weighted average fixed rate	6.14%
Notional amount of interest		$ 30.5	$ 90.3	$ 81.0
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

X

- 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 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



Reference 2: 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=7476318&loc=SL5579245-113959



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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- Definition

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

+ References

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