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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Income Tax [Line Items] |  |
Effective tax rate | 13.10% | 22.10%
Income tax expense (benefit) | $ 24,949 | $ 29,238
Excess tax benefit recognized | 19,567 | $ 19,900
Energy Tax Credit Carryforward |  |
Income Tax [Line Items] |  |
Income tax expense (benefit) | $ 6,200 |

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- Definition Amount of increase (decrease) in income tax expense resulting from a tax benefit (deficiency) associated with a share-based compensation plan other than an employee stock ownership plan (ESOP). + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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