Share-based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses	$ 2.0	$ 1.6
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum unrecognized cost for stock options	$ 18.8
Unrecognized compensation cost, weighted average period of recognition	2 years 3 months 11 days
Time Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Awards with Performance Conditions \| 2015 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Awards with Performance Conditions \| 2016 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance measurement period	1 year
Requisite service period	2 years
Awards with Performance Conditions \| 2017 LTIP
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%

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

No definition available.

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- Definition

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.

+ References

Reference 1: 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.F)
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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)
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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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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
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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