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Earnings Per Share - Schedule of Reconciliation of Weighted Average Shares Used in Calculation of Basic and Diluted Earnings Per Share (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Weighted average common shares-basic	18,577,540us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	18,142,935us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	18,408,238us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	18,897,887us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:
Unexercised stock options net of treasury share repurchase	195,846us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements		156,284us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average common shares-diluted	18,773,386us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	18,142,935us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	18,564,522us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	18,897,887us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 28A

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1500-109256

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

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-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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