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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 12, 2018 | Jul. 25, 2011 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, value of shares authorized to repurchase |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |
Stock repurchase, shares |  | 1,770,000 |  |  |  |  |  |  |  |  | 0 | 44,798 |
Value of shares repurchased |  | $ 52,000,000 |  |  |  |  |  |  |  |  |  | $ 1,545,000 | $ 13,294,000
Average price of repurchased shares |  |  |  |  |  |  |  |  |  |  |  | $ 34.50 |
Cash dividends per common share |  |  | $ 0.180 | $ 0.175 | $ 0.175 | $ 0.175 | $ 0.170 | $ 0.170 | $ 0.170 | $ 0.170 | $ 0.71 | $ 0.68 | $ 0.68
Dividend payment to common shareholders |  |  | $ 38,178,000 | $ 38,178,000 | $ 38,178,000 | $ 38,178,000 | $ 36,361,000 | $ 36,361,000 | $ 36,361,000 | $ 36,361,000 | $ 38,178,000 | $ 36,361,000 | $ 35,969,000
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared date | Feb. 12, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend to be paid | $ 0.18 |  |  |  |  |  |  |  |  |  |  |  |
Dividend to be paid date | Mar. 09, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared, shareholders of record date | Feb. 26, 2018 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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