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Tranche Achievement Date

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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.

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

Unrecognized cost of unvested share-based compensation awards.

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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

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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No definition available.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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No definition available.

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- Definition

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

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

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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- Definition

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

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No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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No definition available.

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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
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Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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Stock-Based Compensation - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) Tranche $ / shares shares	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits related to windfalls			$ 11,600,000
Stock-based compensation expense	$ 1,300,000	$ 1,300,000
Number of restricted stock units issued \| shares	77,680
Weighted average grant date fair value of the stock options granted \| $ / shares	$ 1.86
Number of equal tranches \| Tranche	4
Weighted average vesting period for unrecognized compensation expense	2 years 9 months 18 days
Vest in Four Equal Tranches
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares granted to awards, share-based compensation arrangements \| shares	463,000
Vest Over Four Year Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares granted to awards, share-based compensation arrangements \| shares	120,180
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to options	$ 100,000
Tranche achievement date	2017-12
Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, share-based compensation arrangements	$ 0
Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, share-based compensation arrangements	0
Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, share-based compensation arrangements	$ 0
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of the stock options granted \| $ / shares	$ 2.70
Aggregate number of shares granted to awards, share-based compensation arrangements \| shares	583,180
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Unrecognized compensation expense related to options	$ 3,300,000
Stock Options \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock granted, share-based compensation arrangements	1,100,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of Restricted stock options granted , value	$ 200,000
Weighted average grant date fair value of the stock options granted \| $ / shares	$ 2.70
Unrecognized compensation expense related to non-option	$ 4,100,000
Options vest over vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to options	$ 3,800,000