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Long-Term Debt Credit Facility Agreements (Detail) € in Millions, CAD in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Mar. 24, 2017 CAD | Mar. 24, 2017 USD ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 CAD | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, due in the next twelve months |  |  |  |  |  |  | $ 108,789,000 |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  |  |  |  | 2,564,270,000 |  |  |  |  | $ 1,571,192,000
Debt Instrument, Contingent Maturity Date Threshold |  |  | 90 days |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 755,037,000 | $ 67,412,000 | $ 37,304,000 |  |  |  |  |  |  |
Letters Of Credit Facing Fee |  |  | $ 500 |  |  |  |  |  |  |  |  |
Letters Of Credit Facing Fee Percentage |  |  | 0.25% |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt | $ 4,400,000 | $ 2,700,000 | $ 7,052,000 | $ 0 | $ 0 |  |  |  |  |  |  |
Bank Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  |  |  |  | 903,945,000 |  |  |  |  | 771,192,000
Term Loans And Revolving Loans Maintained as Eurodollar Rate Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, margin |  |  | 2.00% |  |  |  |  |  |  |  |  |
Term Loans and Revolving Loans Maintained as Base Rate or Canadian Prime Rate Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, margin |  |  | 2.00% |  |  |  |  |  |  |  |  |
Revolving Loan - Letters of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |
Multicurrency Revolving Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  | $ 1,190,000,000 |  |  |
US Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  |  | 3.69% | 3.69% |  |  |  |  |
U.S. term loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  | 800,000,000 |  |  |
U.S. term loans [Member] | Bank Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  |  |  |  | $ 800,000,000 |  | $ 800,000,000 |  |  | 310,250,000
Canadian Term Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | CAD |  |  |  |  |  |  |  | CAD 45.5 |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  |  | 3.52% | 3.52% |  |  |  |  |
Canadian Term Loans [Member] | Bank Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  |  |  | CAD 34.1 | $ 27,147,000 | 45.5 |  |  | CAD 59.5 | 44,274,000
Multicurrency Incremental Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | 1,250,000,000 |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, due in the next twelve months |  |  |  |  |  |  | 40,000,000 |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ 6,500,000 |  |  |  |  |  |  |  |  |
Term Loan [Member] | Bank Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  |  |  |  | 827,100,000 |  |  |  |  | 551,200,000
Euro Term Loans [Member] | Bank Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  |  |  |  | $ 0 |  |  | € 187.0 |  | $ 196,668,000
Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  | 1.70% | 3.10% | 3.10% |  |  | 1.90% | 1.90% | 1.90%
Weighted average interest rate after interest rate swap |  |  |  | 2.00% | 1.90% |  |  |  |  |  |  |
Revolving Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  | 1.70% | 3.00% | 3.00% |  |  | 2.00% | 2.00% | 2.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.35% |  |  |  |  |  |  |  |  |
Revolving Loan [Member] | Bank Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  |  |  |  |  | $ 0 |  |  |  |  | $ 99,500,000
Canadian Revolving Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | CAD |  |  |  |  |  |  |  | CAD 15.0 |  |  |  |
Revolving And Term Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ 600,000 |  |  |  |  |  |  |  |  |
Maximum [Member] | Revolving Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.35% |  |  |  |  |  |  |  |  |
Minimum [Member] | Multicurrency Incremental Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing capacity |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |
Minimum [Member] | Revolving Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.20% |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Year 2018 | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  | 5.00% |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Year 2019 | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  | 10.00% |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Year 2020 | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  | 10.00% |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Year 2021 | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  | 10.00% |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Year 2022 | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  | 10.00% |  |  |  |  |  |  |  |  |

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