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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 29, 2018 | Jul. 25, 2011 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, value of shares authorized to repurchase |  | $ 200,000,000 |  |  |  |  |  |  |  |
Stock repurchase, shares |  | 2,588,000 |  |  |  |  |  |  | 818,000 | 0
Value of shares repurchased |  | $ 127,000,000 | $ 75,000,000 |  |  |  |  |  | $ 75,000,000 |
Average price of repurchased shares |  |  |  |  |  |  |  |  | $ 91.67 |
Cash dividends per common share |  |  | $ 0.20 | $ 0.20 | $ 0.18 | $ 0.175 | $ 0.175 | $ 0.175 | $ 0.58 | $ 0.525
Dividend payment to common shareholders |  |  |  |  |  |  |  |  | $ 31,608,000 | $ 28,403,000
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend declared date | Oct. 29, 2018 |  |  |  |  |  |  |  |  |
Cash dividend to be paid | $ 0.20 |  |  |  |  |  |  |  |  |
Dividend to be paid date | Dec. 07, 2018 |  |  |  |  |  |  |  |  |
Dividend declared, shareholders of record date | Nov. 26, 2018 |  |  |  |  |  |  |  |  |

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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=27012166&loc=d3e187085-122770 + Details
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