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Long-Term Debt (Detail) $ in Thousands, CAD in Millions | Sep. 30, 2017 CAD | Sep. 30, 2017 USD ($) | Mar. 24, 2017 CAD | Mar. 24, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($)
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt - principal |  | $ 3,123,622 |  |  | $ 1,571,192 | $ 1,828,674
Less unamortized debt issuance costs |  | 17,452 |  |  | 9,609 | 10,263
Debt long term and short term less unamortized debt issuance costs combined amount |  | 3,106,170 |  |  | 1,561,583 | 1,818,411
Less current portion |  | 640,390 |  |  | 217,127 | 454,212
Long-term debt |  | 2,465,780 |  |  | 1,344,456 | 1,364,199
Bank debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt - principal |  | 1,475,712 |  |  | 771,192 | 1,028,674
5% Senior Notes due 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt - principal |  | $ 280,000 |  |  | $ 500,000 | $ 500,000
Senior note interest rate (percent) | 5.00% | 5.00% |  |  | 5.00% | 5.00%
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% | 5.50%
4 3/4% Senior Notes due 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt - principal |  | $ 300,000 |  |  | $ 0 | $ 0
Senior note interest rate (percent) | 4.75% | 4.75% |  |  |  |
3 1/4% Senior Notes due 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt - principal |  | $ 767,910 |  |  | 0 | 0
Senior note interest rate (percent) | 3.25% | 3.25% |  |  |  |
Revolving Loan [Member] | Bank debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt - principal |  | $ 598,751 |  |  | 99,500 | 306,557
Less current portion |  | 598,800 |  |  |  |
U S Term Loans [Member] | Bank debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt - principal |  | 800,000 |  | $ 800,000 | 310,250 | 346,750
Canadian Term Loans [Member] | Bank debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt - principal | CAD 34.1 | 27,365 | CAD 45.5 |  | 44,274 | 45,393
Euro Term Loans [Member] | Bank debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt - principal |  | 0 |  |  | 196,668 | 234,853
Other Foreign Bank Revolving And Term Loans [Member] | Bank debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt - principal |  | 49,596 |  |  | $ 120,500 | $ 95,121
Less current portion |  | $ 41,600 |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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