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Earnings Per Share - Additional Information (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Earnings Per Share [Line Items]
Stock options, outstanding	1,265,486	1,312,741	1,265,486	1,312,741	1,225,117
Stock options, weighted average exercise price	$ 9.68	$ 7.19	$ 9.68	$ 7.19	$ 8.31
Common stock excluded from calculation of diluted earnings per share	126,541	264,317	150,041	300,908

X

- Definition

Earnings Per Share [Line Items]

+ References

No definition available.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Antidilution



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-Name Accounting Standards Codification



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-Publisher FASB



-Name Accounting Standards Codification



-Glossary Contingent Stock Agreement



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-Name Accounting Standards Codification



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Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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