Period for beginning of vesting.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options target.

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No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options target threshold.

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- Definition

Share based compensation arrangement by share based payment award vesting ratio.

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No definition available.

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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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No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

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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).

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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

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.

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- Definition

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

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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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- Definition

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

+ References

No definition available.

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- Definition

Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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- Definition

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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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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- Definition

Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements.

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Stock-Based Compensation Plans and Employee Benefits - Additional Information (Detail) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 shares
Class Of Stock [Line Items]
Reverse stock split		one-for-two
Reverse stock split conversion ratio	0.5
Share-based payments award, number of shares available for grant		1,700,000
Number of awards, granted		0	77,000	316,000
Black-Scholes Option Pricing Model [Member]
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, shares granted		0
Stock options [Member]
Class Of Stock [Line Items]
Contractual term of stock options, Maximum		10 years
Vesting period		3 years
Portion of increments granted for stock options		one-third
Term of increment grant		one year after the date of grant.
Total unrecognized compensation cost granted \| $		$ 0.1
Term of recognition of unrecognized stock option compensation cost		10 months 24 days
RSUs [Member]
Class Of Stock [Line Items]
Restricted common shares		300,000	400,000	300,000
Restricted Stock [Member]
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, shares granted		344,000
Total unrecognized compensation cost granted \| $		$ 12.7
Term of recognition of unrecognized stock option compensation cost		1 year 7 months 6 days
Weighted-average fair value of the restricted stock \| $ / shares		$ 13.01
Common shares issued		100,000
Restricted Stock [Member] \| Minimum [Member]
Class Of Stock [Line Items]
Vesting period		3 years
Weighted-average fair value of the restricted stock \| $ / shares		$ 12.26
Restricted Stock [Member] \| Maximum [Member]
Class Of Stock [Line Items]
Vesting period		4 years
Weighted-average fair value of the restricted stock \| $ / shares		$ 38.52
Performance-Based Restricted Share Units (PRSUs) [Member]
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, shares granted		0
Performance-based restricted share units, description		In 2018, the Board of Directors approved grants to the chief executive officer, chief operating officer and chief financial officer of PRSUs covering a “target” number of shares, subject to a performance period beginning on March 1, 2018, and ending on February 28, 2021. In 2017, the Board of Directors approved grants to the chief executive officer, chief operating officer and chief financial officer of PRSUs covering a “target” number of shares, subject to a one-year, two-year and three-year performance periods beginning on March 1, 2017.
Performance-based restricted share units, fair value \| $		$ 4.7	$ 3.9
Share-based compensation arrangement by share-based payment award, award amortized period		Feb. 28, 2021	Feb. 28, 2020
Performance-Based Restricted Share Units (PRSUs) [Member] \| Minimum [Member]
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, target		0.00%
Performance-Based Restricted Share Units (PRSUs) [Member] \| Maximum [Member]
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, target threshold		200.00%
Performance Awards [Member] \| 2016 VSEP [Member]
Class Of Stock [Line Items]
Number of awards, granted		0