Share-based Compensation - Additional Information (Detail) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Time Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum unrecognized cost for stock options	$ 23.0	$ 23.0
Unrecognized compensation cost, weighted average period of recognition		2 years 3 months 4 days
2015 LTIP \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
2016 LTIP \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement period		1 year
Requisite service period		2 years
2017 LTIP \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Performance measurement period		1 year
Requisite service period		2 years
Performance adjustment percent		25.00%
Tranche One \| Time Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	40.00%
Tranche Two \| Time Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	60.00%

Share-Based Compensation Arrangement By Share-Based Payment Award, Performance Adjustment Percent

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Performance Measurement Period

+ References

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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

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

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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
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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.

+ References

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

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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

Percentage of vesting of share-based compensation awards.

+ References

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-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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