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Stock-Based Compensation Plans - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) Stock_Plan shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option compensation | $ 4.9 | $ 4.1 | $ 3.3
Accrued liabilities | $ 132.1 | 104.1 |
Stock Options Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration term for stock granted | 10 years |  |
Aggregate number of shares of common stock reserved for issuance which can be granted | shares | 2,550,000 |  |
Number of stock option plans | Stock_Plan | 2 |  |
Number exercisable and fully vested | shares | 41,014 |  |
Fully vested stock options with performance conditions attached | shares | 1,600 |  |
Stock option compensation | $ 4.9 | 4.2 | 3.3
Total intrinsic value exercised | 3.2 | 2.9 | $ 2.8
Total compensation cost related to non-vested stock options not yet recognized | $ 10.7 |  |
Expected compensation cost recognized over the weighted-average period | 2 years 2 months 8 days |  |
Current tax benefit related to stock option compensation | $ 1.2 | 3.0 |
Stock Options Plan [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 24 months |  |
Stock Options Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 5 years |  |
Stock Equivalent Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration term for stock granted |  |  | 10 years
Fully vested stock options with performance conditions attached | shares | 32,005 |  |
Total intrinsic value exercised | $ 2.7 | 1.7 | $ 1.8
Expected compensation cost recognized over the weighted-average period | 1 year 8 months 23 days |  |
Accrued liabilities | $ 15.1 |  |
Number of exercisable SEUs | shares | 34,710 |  |
Compensation cost | $ 5.7 | $ 6.6 | $ 4.7
Stock Equivalent Units [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 11 months |  |
Stock Equivalent Units [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 4 years |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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