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

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

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

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

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Retirement Date

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

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No definition available.

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

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

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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.

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No definition available.

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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.

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No definition available.

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Stock Based Compensation And Employee Benefit Plans [Line Items]

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

+ 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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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 Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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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 total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
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-Name Accounting Standards Codification
-Glossary Financing Activities
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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

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
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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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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

+ Details

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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 1
-Subparagraph (a)
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-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Number of shares for which recognition of compensation cost was accelerated.

+ References

No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Subparagraph (SX 210.3-04)
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Stock-Based Compensation and Employee Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	May. 31, 2014	May. 30, 2014
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation shares authorized for future grant	4,681,841
Share based compensation shares authorized							15,825,223	14,286,754
Effective date of retirement	Dec. 31, 2015
Tax deductions relating to stock-based compensation	$ 412,617		$ 1,184,860		$ 1,302,005
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%
Proceeds from employee common stock purchases	$ 1,131,389		$ 1,106,777		$ 904,471
Employee Stock Purchase Plan
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation shares authorized	2,321,688
Employee stock purchase plan, shares purchased		75,328		68,101		87,578
Employee stock purchase plan, per share price		$ 15.02		$ 16.25		$ 10.33
Proceeds from employee common stock purchases		$ 1,100,000		$ 1,100,000		$ 900,000
Closing fair market value of common stock on first day of current offering period		$ 17.48
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	$ 2,200,000		$ 2,100,000		$ 1,800,000
Performance Shares
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares granted in period	109,705
Share based compensation award granted in period grant-date fair value	$ 1,900,000
Share based compensation award vesting period from date of grant	3 years
Share based compensation award end date of the a three-year performance period	Dec. 31, 2017
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, excluding income taxes paid (three-year average).
Performance Shares \| Performance Period 2012 to 2014
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares earned in period			67,239
Share based compensation dividend earned on shares subject to the awards, shares			4,043
Share based compensation performance-based restricted stock awards, vesting date			Jan. 30, 2015
Share based compensation performance-based restricted stock awards, grant date			Jan. 30, 2012
Performance Shares \| Performance Period 2013 to 2015
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares earned in period	96,732
Share based compensation dividend earned on shares subject to the awards, shares	6,990
Share based compensation performance-based restricted stock awards, vesting date	Feb. 05, 2016
Share based compensation performance-based restricted stock awards, grant date	Feb. 05, 2013
Performance Shares \| Performance Period 2011 to 2013
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares earned in period					85,365
Share based compensation dividend earned on shares subject to the awards, shares					4,350
Share based compensation performance-based restricted stock awards, vesting date					Mar. 07, 2014
Share based compensation performance-based restricted stock awards, grant date					Mar. 07, 2011
Restricted Stock
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares granted in period	432,694
Share based compensation fair value of restricted stock vested	$ 5,500,000		$ 4,100,000		$ 3,500,000
Share based compensation award granted in period weighted average fair value at grant date, per share	$ 16.80		$ 19.05		$ 16.54
Unrecognized compensation related to equity-based awards that have yet to vest	$ 6,900,000
Unrecognized compensation costs are expected to be recognized over a weighted average period (years)	2 years 4 months 24 days
Number of forfeited shares	136,737
Restricted Stock \| Service Based Awards \| Employees And Executives
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares granted in period	273,327
Share based compensation award granted in period grant-date fair value	$ 4,600,000
Share based compensation award vesting period from date of grant	1 year
Restricted Stock \| Service Based Awards \| Employees And Executives \| Annual installment
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award annual installment vesting rate	25.00%
Restricted Stock \| Service Based Awards \| Non Employee Directors
Stock Based Compensation And Employee Benefit Plans [Line Items]
Share based compensation award shares granted in period	45,619
Share based compensation award granted in period grant-date fair value	$ 800,000
Share based compensation award vesting period from date of grant	1 year
Service Based Restricted Stock
Stock Based Compensation And Employee Benefit Plans [Line Items]
Accelerated vesting of unvested service-based restricted stock	21,813
Number of forfeited shares	5,269
Performance Based Restricted Stock
Stock Based Compensation And Employee Benefit Plans [Line Items]
Number of forfeited shares	33,651