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Tranche achievement date.

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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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Unrecognized cost of unvested share-based compensation awards.

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

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Unrecognized cost of unvested options awarded to employees as compensation.

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

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

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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		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) Tranche $ / shares shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 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
Number of restricted stock units issued \| shares	34,720
Weighted average grant date fair value of the stock options granted \| $ / shares	$ 1.06
Number of equal tranches \| Tranche	4
Stock-based compensation	$ 1,247,000	$ 1,502,000	$ 3,763,000	$ 4,130,000
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	360,200
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	40,100
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 200,000		$ 900,000
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		$ 0
Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, share-based compensation arrangements	0		0
Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, share-based compensation arrangements	$ 0		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	$ 1.47
Aggregate number of shares granted to awards, share-based compensation arrangements \| shares	400,300
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Unrecognized compensation expense related to options	$ 3,900,000		3,900,000
Stock Options \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock granted, share-based compensation arrangements	400,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of Restricted stock options granted , value	$ 50,000
Weighted average grant date fair value of the stock options granted \| $ / shares	$ 1.47
Unrecognized compensation expense related to non-option	$ 3,500,000		3,500,000
Options vest over vesting period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to options	$ 3,200,000		$ 3,200,000