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Retirement plans - Narrative (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expected pension expense, net of contributions | $ 5,300,000 |  |
401(k) employee maximum matching contribution | 50.00% |  |
401(k) employer matching contribution | 100.00% |  |
Contributions per employee subject to employer match | 4.00% |  |
Compensation expense related to 401(k) contributions | $ 14,600,000 | $ 13,300,000 | $ 14,400,000
Retirement Plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated benefit obligation | 613,655,000 | $ 554,768,000 |
Contributions by employer | 4,000,000.0 |  |
Discretionary contributions by employer | 12,000,000 |  |
Contributions expected to be made during next fiscal year | 6,700,000 |  |
Actuarial loss estimated to be amortized from accumulated other comprehensive loss into net periodic benefit cost | 6,100,000 |  |
Prior service credit estimated to be amortized from accumulated other comprehensive loss into net periodic benefit cost | $ 100,000 |  |
Actual rate of return on plan assets (as a percent) | 23.60% | (5.60%) | 20.30%
Multiemployer Plans, Pension |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Expected funding deficiency, period | 6 years |  |
Expenses incurred for multi-employer withdrawal liabilities | $ 0 | $ 0 | $ 0
AFTRA Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Contributions | $ 2,400,000 |  |

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- Definition Defined Benefit Plan, Expected Net Periodic Benefit Cost, Net of Contributions, In Next Twelve Months + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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