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Stock-based Compensation Plans - Stock Option and SARs Activities (Detail) - Stock Appreciation Rights (SARs) - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Beginning Balance, Shares | 1,966,549 | 2,582,074 | 3,433,362
Granted, Shares |  | 1,104 | 470,617
Exercised, Shares | (427,598) | (616,563) | (1,269,323)
Expired/forfeited, Shares | (27,974) | (66) | (52,582)
Ending Balance, Shares | 1,510,977 | 1,966,549 | 2,582,074
Beginning Balance, Weighted Average Exercise Price | $ 59.80 | $ 56.36 | $ 52.52
Granted, Weighted Average Exercise Price |  | 81.74 | 75.82
Exercised, Weighted Average Exercise Price | 45.67 | 45.45 | 53.24
Expired/forfeited, Weighted Average Exercise Price | 63.10 | 46.44 | 53.56
Ending Balance, Weighted Average Exercise Price | $ 63.73 | $ 59.80 | $ 56.36

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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