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Derivative Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2014 Cash Flow Hedging [Member] | Dec. 31, 2013 Cash Flow Hedging [Member] | Sep. 30, 2014 Derivative in Fair Value Hedging Relationship [Member] | Dec. 31, 2013 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 | $ 30.5 | $ 102.4 | $ 95.3
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 |  |  |  |

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- Definition Fair flow hedge derivatives expected period of insignificant impact on net income. + References No definition available. + Details
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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=35706170&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=35706170&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 + Details
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