Cash proceeds from employee stock purchase program

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- Definition

Closing fair market value of common stock on first day of current offering period.

+ References

No definition available.

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- Definition

Employee stock purchase plan, maximum percentage of compensation to purchase shares by eligible participants

+ References

No definition available.

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- Definition

Employee stock purchase plan, minimum percentage of common stock fair value as defined by the plan to purchase shares by eligible participants.

+ References

No definition available.

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- Definition

Maximum 401(k) plan contribution rates as a percentage of employees earnings

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- Definition

Share based compensation award shares earned in period.

+ References

No definition available.

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- Definition

Share-based compensation arrangement by share-based payment Award, equity instruments other than options, grant date.

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No definition available.

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- Definition

Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period fair value.

+ References

No definition available.

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- Definition

Share-based compensation arrangement by share-based payment award equity instruments other than options performance period.

+ References

No definition available.

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- Definition

Share-based compensation arrangement by share-based payment award, equity instruments other than options, vesting date.

+ References

No definition available.

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- Definition

The purchase price per share which is the lower of the fair value of the common stock at the beginning or end of the offering period.

+ References

No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors) that was increased based on a 2009 amendment. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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No definition available.

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- Definition

The expiration period following the date of grant of the stock options.

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No definition available.

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- Definition

Share-based compensation arrangement by share-based payment award, options, vested fair value.

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No definition available.

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- Definition

Description of award or option terms as to how many shares or portion of an award or option are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award or option to shares, to sell the shares, and be entitled to the cash proceeds of such sale.

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No definition available.

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- Definition

The date when the period of time over which an employee is required to provide service in exchange for the equity-based payment award ends as specified in the award agreement.

+ References

No definition available.

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- Definition

Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 740

-Section 45

-Paragraph 2

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-Paragraph 62

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- Definition

Number of shares of common stock issued as dividends during the period. Excludes stock splits.

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

+ References

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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.

+ References

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

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- Definition

Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

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- Definition

General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

-Subparagraph (a)

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-Paragraph A240

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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).

+ References

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

-Subparagraph b(2)(c)

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- Definition

The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

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- Definition

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

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- Definition

Description of significant modifications (such as a change in expiration dating, vesting rights, or exercise prices) to an equity-based compensation plan, including the terms of the modifications.

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- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64, 65

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2010	Dec. 31, 2009	Mar. 31, 2009
Stock Based Compensation And Employee Benefit Plans [Line Items]
Description of shares authorized for grant	The NIC plan was adopted in May 1998, amended in November 1998 and May 1999, revised in August 1999, amended and restated in May 2004 and May 2006, and amended in May 2009. The May 2006 amendment and restatement, as approved by the Company's Board of Directors and stockholders, modified the NIC plan to allow for the granting of restricted stock awards in addition to stock options.
Share based compensation shares authorized for grant prior to 2009 amendment	9,286,754
Share based compensation shares authorized for grant	14,286,754
Share based compensation shares authorized for future grant	4,544,679
Tax deductions relating to stock-based compensation	1,509,039		381,315		1,564,480
Employee Stock Option
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award vesting period from date of grant in cumulative installments	1 year		1 year		1 year
Share based compensation award cumulative annual installment vesting rate	25.00%		25.00%		25.00%
Share based compensation award vesting period from date of grant in cumulative installments	5 years		5 years		5 years
Share based compensation stock option grants in period	0		0		0
Unrecognized compensation related to equity-based awards that have yet to vest					0
Share based compensation fair value of shares vested					100,000
Share based compensation aggregate intrinsic value of options exercised			100,000		1,000,000
Share based compensation cash proceeds from exercise of employee stock options			100,000		200,000
Restricted Stock
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation fair value of restricted stock vested	3,600,000		2,800,000		2,100,000
Share based compensation award shares granted in period	279,639
Share based compensation award granted in period weighted average fair value at grant date, per share	10.61		7.86		6.62
Unrecognized compensation related to equity-based awards that have yet to vest	5,400,000
Unrecognized compensation costs are expected to be recognized over a weighted average period (years)	2.3
Restricted Stock \| Service Based Awards
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award vesting period from date of grant in cumulative installments	1 year		1 year		1 year
Share based compensation award cumulative annual installment vesting rate	25.00%		25.00%		25.00%
Share based compensation award shares granted in period	136,389
Share based compensation award granted in period grant-date fair value	1,600,000
Performance-Based Restricted Stock
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares granted in period	127,076
Share based compensation award granted in period weighted average fair value at grant date, per share	10.75
Share based compensation award granted in period grant-date fair value	1,400,000
Share based compensation award performance period	3 years
Share based compensation award end date of the a three-year performance period	Dec. 31, 2013
Performance criteria over the performance period	The actual number of shares earned will be based on the Company's performance related to the following performance criteria over the performance period Operating income growth (three-year compound annual growth rate) Total revenue growth (three-year compound annual growth rate) Cash flow return on invested capital (three-year average)
Performance-Based Restricted Stock \| Performance Period 2009 to 2011
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares earned in period	172,751
Share based compensation dividend earned on shares subject to the awards, shares	25,008
Share based compensation performance-based restricted stock awards, vesting date	Feb. 01, 2012
Share based compensation performance-based restricted stock awards, grant date	Feb. 01, 2009
Performance-Based Restricted Stock \| Performance Period 2008 to 2010
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares earned in period			128,574
Share based compensation dividend earned on shares subject to the awards, shares			16,174
Share based compensation performance-based restricted stock awards, vesting date			Mar. 04, 2011
Share based compensation performance-based restricted stock awards, grant date			Mar. 04, 2008
Employee Stock Purchase Plan
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation shares authorized for grant	2,321,688
Percentage of compensation that eligible employees can use to purchase common stock, maximum	15.00%		15.00%		15.00%
Percentage of fair market value eligible employees can purchase common stock as defined, minimum	85.00%		85.00%		85.00%
Employee stock purchase plan, shares purchased		103,593		154,874		105,223
Employee stock purchase plan, per share price		$ 6.290		$ 4.386		$ 4.420
Cash proceeds form employee stock purchase plan		652,000		679,000		465,000
Closing fair market value of common stock on first day of current offering period		$ 12.48
Defined Contribution 401(k) Profit Sharing Plan
Stock Based Compensation And Employee Benefit Plans [Line Items]
Matching contribution to 401k, maximum	5.00%
Company matching contribution expense	1,500,000		1,400,000		1,200,000