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Stock-Based Compensation - Stock Option Activity (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Outstanding Options, Beginning Balance | 13,158 | 42,288
Options Granted | 0 | 0
Options Exercised | (13,158) | (27,942)
Options Canceled |  | (1,188)
Outstanding Options, Ending Balance |  | 13,158
Weighted Average Exercise Price Per Share, Outstanding, Beginning Balance | $ 23.36 | $ 20.05
Weighted Average Exercise Price Per Share, Granted | 0 | 0
Weighted Average Exercise Price Per Share, Exercised | $ 50.37 | 35.73
Weighted Average Exercise Price Per Share, Canceled |  | 17.92
Weighted Average Exercise Price Per Share, Outstanding, Ending Balance |  | $ 23.36

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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