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Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares issuable upon exercise of outstanding options | 2,877,000 |  | 2,877,000 |  | 3,086,000
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 300,000 |  | 300,000 |  |
Estimated pretax compensation expense | $ 6.0 |  | $ 6.0 |  |
Expiration period in years |  |  | 4 years |  |
Service period in years |  |  | 4 years |  |
Restricted stock units settled in shares exercisable in percentage |  |  | 25.00% |  |
Restricted stock units settled in cash exercisable in percentage |  |  | 25.00% |  |
Stock compensation and recognized liability | 1.4 |  | $ 3.3 |  |
Long-term incentive, cash-based awards |  |  | 3 years |  |
Performance unit award expenses | $ 1.4 | $ 1.7 | $ 3.7 | $ 2.6 |
Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage |  |  | 33.33% |  |
Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage |  |  | 33.33% |  |
Non-Employee Directors' Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Expiration period in years |  |  | 10 years |  |
Employee stock options exercisable in percentage |  |  | 100.00% |  |
Employee Stock Option [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Expiration period in years |  |  | 10 years |  |
Service period in years |  |  | 4 years |  |
Employee Stock Option [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage |  |  | 25.00% |  |
Restricted Stock Units [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 1,445,000 |  | 1,445,000 |  | 1,712,000
Service period in years |  |  | 4 years |  |
Restricted Stock Units [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage |  |  | 20.00% |  |
Service period in years |  |  | 3 years |  |
Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage |  |  | 50.00% |  |
Service period in years |  |  | 3 years |  |
Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage |  |  | 30.00% |  |
Service period in years |  |  | 3 years |  |
Deferred Stock Units to be Settled in Shares [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Service period in years |  |  | 3 years |  |
2016 Incentive Compensation Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock subject to awards of stock options or stock appreciation rights payable in shares |  |  | 1.0 |  |
Common stock subject to any other form of award |  |  | 1.35 |  |
Common stock available for future share-based awards | 4,000,000 |  | 4,000,000 |  |
Shares issuable upon exercise of outstanding options | 500,000 |  | 500,000 |  |
2008 Incentive Compensation Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares issuable upon exercise of outstanding options | 2,400,000 |  | 2,400,000 |  |
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 1,300,000 |  | 1,300,000 |  |
2008 Incentive Compensation Plan [Member] | Chief Executive Officer [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Service period in years |  |  | 2 years |  |
Restricted stock units settled in cash exercisable in percentage |  |  | 50.00% |  |

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- Definition The number that is multiplied against each share issued that are subject to awards of any stock-based compensation other than stock options and stock appreciation rights which is then subtracted from the available authorized grant pool. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 + Details
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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 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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