Stock-Based Compensation - Additional Information (Detail) $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($) plan shares	Mar. 31, 2015 USD ($) shares
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of compensation plans \| plan	2
Tax benefit related to stock-based compensation expense \| $	$ 0.1	$ 0.1
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Weighted average remaining contractual life	4 years 4 months 27 days
Aggregate intrinsic value, outstanding \| $	$ 33.6
Restricted stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period	3 years
Restricted stock granted	185,000	0
2010 And 2013 Plan \| Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock award exercise expiration period from grant date	10 years
Options exercised after ten years	10,000
Stock options granted	30,207
2010 And 2013 Plan \| Stock options \| 10% Percent Owners
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock ownership percentage for 110% exercise price (more than)	10.00%
Stock award exercise expiration period from grant date	5 years
2010 And 2013 Plan \| Stock options \| Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Exercise price for common stock as a percentage of fair value (at least)	100.00%
2010 And 2013 Plan \| Stock options \| Minimum \| 10% Percent Owners
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Exercise price for common stock as a percentage of fair value (at least)	110.00%
2013 Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Plan effective date	May 22, 2013
Plan expiration date	May 22, 2023
2013 Plan \| Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of shares authorized under plan	2,639,000
2013 Plan \| Restricted stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock granted	185,147

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Share Based Compensation Arrangement By Share Based Payment Award Required Stock Ownership Percentage To Exercise At 110 Percent of Fair Value

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable After Expiration Date, Number

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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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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Date the equity-based award expires, in CCYY-MM-DD format.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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