Debt - Components of Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal	$ 1,632,640	$ 1,627,855
Unamortized Debt Issuance Costs	(27,895)	(29,170)	$ (660)
Less current portion of debt	(22,771)	(20,864)
Debt Less Unamortized Debt Issuance Costs	1,604,745	1,598,685
Total long-term debt, Principal	1,609,869	1,606,991
Less current portion of debt, Debt Less Unamortized Debt Issuance Costs	(22,771)	(20,864)
Total long-term debt, Debt Less Unamortized Debt Issuance Costs	1,581,974	1,577,821
New Credit Agreement \| Term Loan A Facility, mature October 31, 2022
Debt Instrument [Line Items]
Principal	146,250	148,125
Unamortized Debt Issuance Costs	(3,779)	(3,996)
Debt Less Unamortized Debt Issuance Costs	142,471	144,129
New Credit Agreement \| Term Loan B Facility, mature October 31, 2024
Debt Instrument [Line Items]
Principal	497,500	498,750
Unamortized Debt Issuance Costs	(6,041)	(6,280)
Debt Less Unamortized Debt Issuance Costs	491,459	492,470
New Credit Agreement \| U.S. Revolving Credit Facility
Debt Instrument [Line Items]
Principal	64,380	56,945
Unamortized Debt Issuance Costs	(5,145)	(5,442)
Debt Less Unamortized Debt Issuance Costs	59,235	51,503
New Credit Agreement \| Australian Revolving Sub-Facility
Debt Instrument [Line Items]
Principal	33,706	33,033
Unamortized Debt Issuance Costs	(572)	(605)
Debt Less Unamortized Debt Issuance Costs	33,134	32,428
Senior Notes \| 6.125% Notes, due December 1, 2022
Debt Instrument [Line Items]
Principal	250,000	250,000
Unamortized Debt Issuance Costs	(2,979)	(3,148)
Debt Less Unamortized Debt Issuance Costs	247,021	246,852
Senior Notes \| 4.875% Notes, due November 1, 2025
Debt Instrument [Line Items]
Principal	600,000	600,000
Unamortized Debt Issuance Costs	(9,379)	(9,699)
Debt Less Unamortized Debt Issuance Costs	590,621	590,301
Capital Leases
Debt Instrument [Line Items]
Principal	33,886	36,288
Debt Less Unamortized Debt Issuance Costs	33,886	36,288
Other Subsidiary Debt
Debt Instrument [Line Items]
Principal	6,918	4,714
Debt Less Unamortized Debt Issuance Costs	$ 6,918	$ 4,714

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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