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Employee Benefit Plans - Summary of Changes in Benefit Obligation and Plan Assets for Defined Benefit Pension and Postretirement Benefit Plans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Change in Plan Assets: |  |  |
Plan assets at fair value, beginning of year | $ 460,952 |  |
Plan assets at fair value, end of year | 401,929 | $ 460,952 |
Net Amount Recognized in Consolidated Balance Sheets: |  |  |
Noncurrent accrued benefit liability | (186,380) | (187,830) |
Amounts Recognized in Accumulated Other Comprehensive Loss: |  |  |
Tax benefits related to changes in benefit obligation and plan assets which are also included in accumulated other comprehensive loss | 79,000 | 81,200 |
Defined benefit pension plans |  |  |
Change in Benefit Obligation: |  |  |
Benefit obligation, beginning of year | 639,319 | 605,851 |
Service cost | 4,223 | 4,045 | $ 5,557
Interest cost | 18,117 | 17,961 | 24,526
Impact of currency exchange rate changes | (7,793) | 12,932 |
Actuarial (gain) loss | (34,214) | 32,817 |
Benefits paid | 50,211 | 34,314 |
Plan amendments | 809 | 27 |
Settlements | (2,748) | 0 |
Benefit obligation, end of year | 567,502 | 639,319 | 605,851
Change in Plan Assets: |  |  |
Plan assets at fair value, beginning of year | 460,952 | 433,780 |
Actual return on plan assets | (18,162) | 47,727 |
Employer contributions | 18,216 | 4,807 |
Impact of currency exchange rate changes | (5,554) | 8,952 |
Benefits paid | (50,211) | (34,314) |
Settlements | (3,312) | 0 |
Plan assets at fair value, end of year | 401,929 | 460,952 | 433,780
Net Amount Recognized in Consolidated Balance Sheets: |  |  |
Funded status, end of year | (165,573) | (178,367) |
Current accrued benefit liability | (4,395) | (16,180) |
Noncurrent accrued benefit liability | (161,178) | (162,187) |
Net amount recognized | (165,573) | (178,367) |
Amounts Recognized in Accumulated Other Comprehensive Loss: |  |  |
Net actuarial loss (gain) | 238,862 | 243,295 |
Prior service cost (credit) | 220 | 135 |
Total amount recognized in accumulated other comprehensive loss, before tax | 239,082 | 243,430 |
Postretirement benefit plans |  |  |
Change in Benefit Obligation: |  |  |
Benefit obligation, beginning of year | 7,752 | 27,614 |
Service cost | 1 | 2 | 52
Interest cost | 208 | 812 | 1,143
Impact of currency exchange rate changes | 0 | 0 |
Actuarial (gain) loss | (596) | (2,597) |
Benefits paid | 1,164 | 1,818 |
Plan amendments | 0 | (16,261) |
Settlements | 0 | 0 |
Benefit obligation, end of year | 6,201 | 7,752 | 27,614
Change in Plan Assets: |  |  |
Plan assets at fair value, beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 1,164 | 1,818 |
Impact of currency exchange rate changes | 0 | 0 |
Benefits paid | (1,164) | (1,818) |
Settlements | 0 | 0 |
Plan assets at fair value, end of year | 0 | 0 | $ 0
Net Amount Recognized in Consolidated Balance Sheets: |  |  |
Funded status, end of year | (6,201) | (7,752) |
Current accrued benefit liability | (1,090) | (1,400) |
Noncurrent accrued benefit liability | (5,111) | (6,352) |
Net amount recognized | (6,201) | (7,752) |
Amounts Recognized in Accumulated Other Comprehensive Loss: |  |  |
Net actuarial loss (gain) | (3,071) | (2,795) |
Prior service cost (credit) | (14,224) | (16,261) |
Total amount recognized in accumulated other comprehensive loss, before tax | $ (17,295) | $ (19,056) |

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