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Long-Term Debt (Detail) - USD ($) $ in Thousands | Aug. 01, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  | $ 2,722,866 | $ 2,317,723 | $ 2,977,311
Less unamortized debt issuance costs |  | 11,875 | 13,109 | 14,639
Debt long term and short term less unamortized debt issuance costs combined amount |  | 2,710,991 | 2,304,614 | 2,962,672
Less current portion |  | 886,458 | 170,214 | 788,731
Long-term debt |  | 1,824,533 | 2,134,400 | 2,173,941
Bank debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  | 1,361,402 | 951,800 | 1,617,851
5 1/2% Senior Notes due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  | $ 300,000 | $ 300,000 | $ 300,000
Senior note interest rate (percent) |  | 5.50% | 5.50% | 5.50%
4 3/4% Senior Notes due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  | $ 300,000 | $ 300,000 | $ 300,000
Senior note interest rate (percent) |  | 4.75% | 4.75% | 4.75%
3 1/4% Senior Notes due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  | $ 739,245 | $ 744,380 | $ 759,460
Senior note interest rate (percent) |  | 3.25% | 3.25% | 3.25%
Finance leases [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  | $ 22,219 | $ 21,543 | $ 0
Revolving Loan [Member] | Bank debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  | 506,000 | 0 | 760,000
Less current portion |  | 506,000 |  |
U S Term Loans [Member] | Bank debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  | 800,000 | 800,000 | 800,000
Less current portion |  | 40,000 |  |
Canadian Term Loans [Member] | Bank debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  | 16,133 | 22,103 | 22,937
Other Foreign Bank Revolving And Term Loans [Member] | Bank debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  | 39,269 | $ 129,697 | $ 34,914
Less current portion |  | 39,300 |  |
Finance leases [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less current portion |  | $ 1,200 |  |
Subsequent Event [Member] | 5 1/2% Senior Notes due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Extinguishment of debt | $ 300,000 |  |  |
Senior note interest rate (percent) | 5.50% |  |  |

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