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v3.21.2

Stockholders' Equity - (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 1,100,000 |  | 1,100,000 |
Stock-based compensation expense | $ 3.8 | $ 2.5 | $ 6.9 | $ 7.3
Share-based Payment Arrangement, Expense, Tax Benefit | 1.0 | 0.6 | 1.8 | 1.9
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised |  |  | 1.2 | 0.7
Payment, Tax Withholding, Share-based Payment Arrangement | $ 0.0 | $ 0.0 | $ 1.7 | $ 0.7
Weighted Average Number of Shares Outstanding, Diluted | 16,971,000 | 16,783,000 | 16,689,000 | 16,689,000
Equity Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 14.1 |  | $ 14.1 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of share-based awards granted |  |  | 179,528 |
Grant-date fair value of awards per share |  |  | $ 35.68 |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 186,000 | 188,000 | 0 | 107,000
Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of share-based awards granted |  |  | 68,070 |
Grant-date fair value of awards per share |  |  | $ 39.79 |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 98,000 | 0 | 0 | 0

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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + 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 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1707-109256 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1500-109256 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1757-109256 + Details
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