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Employee Benefit Plans - Summary of Retirement Plan Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Employee Benefit Plans [Line Items] |  |  |
Retirement plan expense | $ 56,914 | $ 58,096 | $ 57,073
Defined benefit pension plans |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |
Retirement plan expense | 7,428 | 13,999 | 14,779
Defined contribution retirement plans |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |
Retirement plan expense | 38,508 | 37,661 | 40,673
Postretirement benefit plans |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |
Retirement plan expense | 963 | 1,343 | 1,396
Deferred compensation and excess benefit plans |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |
Retirement plan expense | $ 10,015 | $ 5,093 | $ 225

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- Definition Schedule of Employee Benefit Plans [Line Items] + References No definition available. + Details
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- Definition The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: 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=49170846&loc=d3e28014-114942 + Details
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