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Stock Compensation Plans - Purchased Restricted Stock Plan - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
PRSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issued Shares (in shares) | 61,991 | 66,674 | 41,801
Aggregate Purchase Price | $ 8.5 | $ 9.3 | $ 5.8
Total fair value of vested | $ 22.4 |  |
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Covered Shares (in shares) | 30,996 | 33,337 | 20,901
Total fair value of vested | $ 7.1 |  |
Unrecognized compensation cost related to non-vested stock options and SSAR, RSU, PRS and Cash RSU awards granted | $ 10.7 |  |
Unrecognized compensation cost related to non-vested stock options and SSAR, RSU, PRS and Cash RSU awards granted, weighted average period, in years | 1 year 9 months 18 days |  |

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- Definition Aggregate employee purchase price for share based compensation arrangement by share based payment award equity instruments other than option grants in period. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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