Equity Incentive Plan - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	$ 422,959	$ 320,510
Stock options granted to employees	354,500
Unrecognized stock-based compensation cost	3,300,000
Unrecognized stock-based compensation cost, weighted-average recognition period	3 years
Intrinsic value of stock options and SARs	464,241	1,192,545
Cash received from exercise of stock options	1,097,016	114,656
Options and SARs outstanding	2,000,000
Weighted average exercise price per share	$ 8.72
Intrinsic value of Options and SARs	$ 11,700,000
Weighted average remaining contractual term	6 years 5 months 9 days
Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based awards, contractual term	10 years
Stock Awards \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option and incentive plan, vesting period	1 year
Stock Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option and incentive plan, vesting period	4 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted to Board of Directors	13,800
Stock Options and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option and incentive plan, vesting period	4 years

Share Based Compensation Arrangement by Share Based Payment Award Contractual Term Range

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, And Stock Appreciation Rights, Exercises in Period, Total Intrinsic Value

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No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Options and Stock Appreciation Rights, Outstanding, Intrinsic Value

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Options And Stock Appreciation Rights Outstanding Number

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No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Options and Stock Appreciation Rights Outstanding Weighted Average Remaining Contractual Term

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No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Options and Stock Appreciation Rights Weighted Average Exercise Price

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No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph b

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The cash inflow from other equity not otherwise defined in the taxonomy.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 19

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Name Statement of Financial Accounting Standard (FAS)

-Number 95

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Gross number of share options (or share units) granted during the period.

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