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 amount of compensation to purchase shares by eligible participants.

+ References

No definition available.

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- Definition

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

+ References

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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

+ References

No definition available.

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- Definition

The intrinsic value of service-based or performance-based restricted stock awards, granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

No definition available.

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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.

+ 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 date when the performance measurement period and 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

Share Based Compensation Arrangement by Share Based Payment Awards Performance Period

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No definition available.

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- Definition

Description of annual installment vesting rate as to how many shares or portion of an award 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 to shares, to sell the shares, and be entitled to the cash proceeds of such sale.

+ 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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 62

-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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-Name Accounting Standards Codification

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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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- 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

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.

+ References

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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.

+ References

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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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-Topic 718

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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).

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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).

+ References

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

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Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2010
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation shares authorized for future grant	4,078,668
Tax deductions relating to stock-based compensation	$ 1,351,115		$ 1,509,039		$ 381,315
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%
Compensation Amount that eligible employees can use to purchase common stock	25,000		25,000		25,000
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		78,045		103,593		154,874
Employee stock purchase plan, per share price		$ 10.33		$ 6.29		$ 4.39
Cash proceeds form employee stock purchase plan		806,000		652,000		679,000
Closing fair market value of common stock on first day of current offering period		$ 12.15
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	1,700,000		1,500,000		1,400,000
Restricted Stock
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares granted in period	499,929
Share based compensation award granted in period weighted average fair value at grant date, per share	$ 11.83		$ 10.61		$ 7.86
Share based compensation fair value of restricted stock vested	3,600,000		3,600,000		2,800,000
Unrecognized compensation related to equity-based awards that have yet to vest	6,000,000
Unrecognized compensation costs are expected to be recognized over a weighted average period (years)	2 years 4 months 24 days
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	364,947
Share based compensation award granted in period grant-date fair value	4,200,000
Performance-Based Restricted Stock
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares granted in period	134,982
Share based compensation award granted in period grant-date fair value	$ 1,700,000
Share based compensation award granted in period weighted average fair value at grant date, per share	$ 12.36
Share based compensation award performance period	3 years
Share based compensation award end date of the a three-year performance period	Dec. 31, 2014
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 consolidated revenue growth (three-year compound annual growth rate); and Cash flow return on invested capital (three-year average).
Performance-Based Restricted Stock \| Performance Period 2010 to 2012
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares earned in period	78,747
Share based compensation dividend earned on shares subject to the awards, shares	8,013
Share based compensation performance-based restricted stock awards, vesting date	Feb. 01, 2013
Share based compensation performance-based restricted stock awards, grant date	Feb. 01, 2010
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. 03, 2012
Share based compensation performance-based restricted stock awards, grant date			Feb. 03, 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