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Shareholders' Equity - Summary of Outstanding Shares of Common Stock (Detail) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |  |
Shares outstanding at beginning of year | 43,550 | 43,420 | 43,054
Treasury shares issued for: |  |  |
Restricted stock awards | 28 | 108 | 206
401(k) plan |  |  | 134
Employee stock options exercised | 36 | 22 | 26
Shares outstanding at end of year | 43,614 | 43,550 | 43,420

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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: 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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