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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 08, 2021 | Jul. 25, 2011 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, value of shares authorized to repurchase |  | $ 200.0 |  |  |  |  |  |  |  |  |  |  |
Stock repurchase, shares |  | 2,588,000 |  |  |  |  |  |  |  |  | 0 | 0 |
Value of shares repurchased |  | $ 127.0 |  |  |  |  |  |  |  |  |  |  | $ 75.0
Average price of repurchased shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 91.67
Cash dividends per common share |  |  | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.80 | $ 0.80 |
Dividend payment to common shareholders |  |  |  |  |  |  |  |  |  |  | $ 44.0 | $ 43.5 | $ 42.4
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared date | Feb. 08, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend to be paid | $ 0.20 |  |  |  |  |  |  |  |  |  |  |  |
Dividend to be paid date | Mar. 05, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared, shareholders of record date | Feb. 22, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase, shares |  |  |  |  |  |  |  |  |  |  |  |  | 818,000

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120397183&loc=d3e187085-122770 + Details
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