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Summary of Stock Option Activity (Detail) (Stock Option And Award Plans, USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock Option And Award Plans |  |  |
Options Granted Under Plans |  |  |
Beginning balance | 4,350,631 | 4,902,818 | 4,798,677
Granted | 264,950 | 842,273 | 989,449
Exercised | (1,249,759) | (890,236) | (430,340)
Cancelled | (392,034) | (504,224) | (454,968)
Ending Balance | 2,973,788 | 4,350,631 | 4,902,818
Vested and exercisable at end of period | 1,505,707 |  |
Number of Shares |  |  |
Beginning balance | 4,350,631 | 4,902,818 | 4,798,677
Granted | 264,950 | 842,273 | 989,449
Exercised | (1,249,759) | (890,236) | (430,340)
Cancelled | (392,034) | (504,224) | (454,968)
Ending balance | 2,973,788 | 4,350,631 | 4,902,818
Vested and exercisable at end of period | 1,505,707 |  |
Weighted Average Exercise Price |  |  |
Beginning balance | $ 23.01 | $ 21.87 | $ 21.71
Granted | $ 33.09 | $ 22.01 | $ 19.66
Exercised | $ 21.60 | $ 14.62 | $ 10.84
Cancelled | $ 25.27 | $ 25.14 | $ 25.77
Ending balance | $ 24.20 | $ 23.01 | $ 21.87
Vested and exercisable at end of period | $ 24.92 |  |
Weighted Average Grant Date Fair Value |  |  |
Beginning balance | $ 9.17 | $ 8.61 | $ 8.47
Granted | $ 12.05 | $ 9.59 | $ 8.20
Exercised | $ 8.58 | $ 6.16 | $ 4.80
Cancelled | $ 10.02 | $ 9.76 | $ 9.87
Ending balance | $ 9.57 | $ 9.17 | $ 8.61
Vested and exercisable at end of period | $ 8.64 |  |

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- Definition 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. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -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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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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