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Stock-Based Compensation - Shares Issued in Connection with Stock Compensation Awards (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Compensation And Retirement Disclosure [Abstract] |  |  |  |
New shares issued from available authorized shares |  | 31,511 | 153,275 | 132,671
Issued from available treasury stock | 266,799 |  | 508,949 | 7,640
Total | 266,799 | 31,511 | 662,224 | 140,311
Proceeds from stock option exercises | $ 13,743 | $ 1,669 | $ 34,189 | $ 7,211

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- Definition New Shares Issued Related To Stock Option Exercises From Available Authorized Shares + References No definition available. + Details
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- Definition Treasury Shares Issued Related To Stock Option Exercises + References No definition available. + Details
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- Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Number of share instruments newly issued under a share-based compensation 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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