Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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

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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).

+ 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 (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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Subsequent Events - Additional Information (Detail) - shares	Apr. 30, 2018	Apr. 23, 2018	Jan. 26, 2018
Subsequent Event [Member] \| Non Executive Employees [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights		One-third of the Time-Based Shares will vest on a specified initial vesting date, an additional one-third of the Time-Based Shares will vest on the first anniversary of the specified initial vesting date, and the remaining one-third of the Time-Based Shares will vest on the second anniversary of the specified initial vesting date
Restricted Stock [Member] \| Non Executive Employees [Member]
Subsequent Event [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights			first three anniversaries
Restricted Stock [Member] \| Tranche One [Member] \| Non Executive Employees [Member]
Subsequent Event [Line Items]
Market-based vesting percentage, restricted shares			25.00%
Restricted Stock [Member] \| Tranche Two [Member] \| Non Executive Employees [Member]
Subsequent Event [Line Items]
Market-based vesting percentage, restricted shares			25.00%
Restricted Stock [Member] \| LTIP [Member]
Subsequent Event [Line Items]
Restricted shares of common stock issued			511,361
Restricted Stock [Member] \| Subsequent Event [Member] \| Tranche One [Member] \| Non Executive Employees [Member]
Subsequent Event [Line Items]
Market-based vesting percentage, restricted shares		33.33%
Restricted Stock [Member] \| Subsequent Event [Member] \| Tranche Two [Member] \| Non Executive Employees [Member]
Subsequent Event [Line Items]
Market-based vesting percentage, restricted shares		33.33%
Restricted Stock [Member] \| Subsequent Event [Member] \| Tranche Three [Member] \| Non Executive Employees [Member]
Subsequent Event [Line Items]
Market-based vesting percentage, restricted shares		33.33%
Restricted Stock [Member] \| Subsequent Event [Member] \| LTIP [Member]
Subsequent Event [Line Items]
Restricted shares of common stock issued	9,846
Restricted Stock [Member] \| Subsequent Event [Member] \| LTIP [Member] \| Non Executive Employees [Member]
Subsequent Event [Line Items]
Restricted shares of common stock issued		92,061