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Net Income Per Common Share - Average Exercise Prices of Options Excluded from Computation of Diluted Net Income Per Common Share (Detail) - $ / shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Abstract] |  |  |  |
Shares | 75,543 | 283,130 | 39,120 | 366,628
Average Exercise Price | $ 46.46 | $ 30.32 | $ 46.10 | $ 29.87

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- Definition Average exercise prices of options excluded from computation of diluted net income per common share. + References No definition available. + Details
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- Definition Schedule of antidilutive securities excluded from computation of earnings per share. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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