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Employee Retirement and Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Employee Benefit Plans [Line Items]
Stock options, shares granted			1,992,595
Stock options, shares exercised			48,662
Stock options, shares forfeited			315,140
Stock options, shares expired			265,024
Employee Contribution			100.00%
Percentage of employees contribution matched by the company			4.00%
Employer Contribution	$ 1.2	$ 1.1	$ 4.0	$ 3.1
Employee Stock Purchase Plan [Member]
Employee Benefit Plans [Line Items]
Common stock, shares issued under ESPP			117,471
Market Condition [Member]
Employee Benefit Plans [Line Items]
Stock options, shares granted			527,850
Stock options, shares forfeited			33,620
Share units granted			228,840
Share units forfeited			27,940
Restricted Stock Units (RSUs) [Member]
Employee Benefit Plans [Line Items]
Share units granted			875,166
Share units vested			368,506
Share units forfeited			196,167
Restricted Stock [Member]
Employee Benefit Plans [Line Items]
Share units granted			92,910
Share units vested			98,988
Deferred Stock Units [Member]
Employee Benefit Plans [Line Items]
Share units granted			60,972
Share units released			0

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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)
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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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