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Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |
Provisions charged from operations for the profit sharing plan and retirement savings plans | $ 42.9 | $ 55.3 | $ 50.3
Contribution of common stock to profit sharing plan | 830,600 | 787,500 | 965,200
Defined benefit pension plan corridor rate | 10.00% |  |
Percentage of equity allocation, maximum | 70.00% |  |
Percentage of fixed income allocation, minimum | 30.00% |  |
Equity Security [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Equity securities, minimum | 40.00% |  |
Equity securities, maximum | 50.00% |  |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Equity securities, minimum | 50.00% |  |
Equity securities, maximum | 60.00% |  |

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- Definition Defined benefit plan corridor percentage. + References No definition available. + Details
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- Definition Percentage of equity allocation maximum. + References No definition available. + Details
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- Definition Percentage of fixed income allocation including cash minimum. + References No definition available. + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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