Period Of Historical Data Used To Calculate Expected Volatility In Year

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions risk free interest rate.

+ References

No definition available.

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- Definition

Share-based compensation arrangement by share-based payment award vesting range minimum in times of original number granted.

+ References

No definition available.

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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.

+ References

No definition available.

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- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Period Type:	instant

- 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.

+ References

+ Details

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Period Type:	duration

- 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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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

+ Details

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Period Type:	duration

- Definition

Weighted average expected volatility rate of share-based compensation awards.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

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

+ References

+ Details

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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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.

+ References

+ Details

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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- Definition

Gross 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). 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.

+ References

No definition available.

+ Details

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- Definition

Gross value of stock (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). Stock 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.

+ References

No definition available.

+ Details

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Capital Stock - Capital Stock (Detail)	1 Months Ended	9 Months Ended
Capital Stock - Capital Stock (Detail)	Mar. 31, 2017 $ / shares	Sep. 30, 2017 USD ($) time $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares	Dec. 31, 2016 $ / shares shares
Class of Stock [Line Items]
Preferred stock, share authorized (in shares)		25,000,000		25,000,000
Preferred stock, par value (in usd per share) \| $ / shares		$ 1		$ 1
Common stock, share authorized (in shares)		725,000,000		725,000,000
Common stock, par value (in usd per share) \| $ / shares		$ 0.001		$ 0.001
Preferred stock, share issued (in shares)		0
Number of common shares or units issued related to the exercise of share based compensation during the period (in shares)		100,000
Stock options granted (in shares)		732,314	916,015
Stock option per share value (in usd per share) \| $ / shares		$ 10.18	$ 9.44
Restricted stock units
Class of Stock [Line Items]
Number of shares or units granted equity based compensation awards (in shares)		344,319	238,609
Fair value of granted stock \| $		$ 3,500,000	$ 2,300,000
Vesting period		3 years
Performance shares
Class of Stock [Line Items]
Number of shares or units granted equity based compensation awards (in shares)		0	311,691
Fair value of granted stock \| $		$ 0	$ 3,600,000
Vesting period		3 years
Number of times performance units to vest, minimum \| time		0
Restricted stock awards
Class of Stock [Line Items]
Number of shares or units granted equity based compensation awards (in shares)		89,387	67,000
Fair value of granted stock \| $		$ 900,000	$ 600,000
Stock option
Class of Stock [Line Items]
Stock option, term		10 years
Vesting period		3 years
Weighted-average grant-date fair value of options granted (in usd per share) \| $ / shares	$ 4.71
Expected volatility used in computing fair value of options granted		62.40%
Expected life used in computing fair value of options granted, years		5 years 6 months
Dividend yield used in computing fair value of options granted		2.50%
Risk-free interest rate used in computing fair value of options granted		2.00%
Estimated forfeiture rate used in computing fair value of options granted		7.40%
Period of historical data used to calculate expected volatility in years		5 years