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Postretirement Benefit Plans - Defined Contribution Plan Expenses for the Company's Retirement Savings Plans and Profit Sharing Plan (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution expense | $ 2,347 | $ 2,405 | $ 4,511 | $ 4,300
Retirement Savings Plans [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution expense | 1,136 | 1,178 | 2,320 | 2,309
Profit Sharing Plan [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution expense | $ 1,211 | $ 1,227 | $ 2,191 | $ 1,991

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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