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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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- Definition Defined contribution plan employer matching contribution limit percent. + References No definition available. + Details
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- Definition Employee Benefit Plans [Line Items] + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options shares released in period. + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition 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 + Details
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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 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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 + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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