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Employee Retirement and Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Employee Benefit Plans [Line Items]
Stock options, shares granted	2,239,417
Stock options, shares exercised	253,653
Stock options, shares expired	288,250
Employee Contribution	100.00%
Percentage of employees contribution matched by the company	4.00%
Employer Contribution	$ 1.2	$ 1.6
Employee Stock Purchase Plan [Member]
Employee Benefit Plans [Line Items]
Common stock, shares issued under ESPP	55,812
Market Condition [Member]
Employee Benefit Plans [Line Items]
Stock options, shares granted	633,012
Stock options, shares forfeited	207,527
Share units granted	205,993
Share units forfeited	33,692
Restricted Stock Units (RSUs) [Member]
Employee Benefit Plans [Line Items]
Share units granted	696,260
Share units vested	148,302
Share units forfeited	58,045
Restricted Stock [Member]
Employee Benefit Plans [Line Items]
Share units vested	14,271
Deferred Stock Units [Member]
Employee Benefit Plans [Line Items]
Share units granted	25,331
Share units vested	25,331

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Defined contribution plan employer matching contribution limit percent.

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Employee Benefit Plans [Line Items]

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ 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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Number of shares issued during the period as a result of an employee stock purchase plan.

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