Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Debt Instrument [Line Items]
Long-term debt	$ 1,989,701	$ 1,376,259	$ 1,430,950
Less current portion	423,274	87,776	118,155
Long-term debt, noncurrent	1,566,427	1,288,483	1,312,795
5% Senior Notes
Debt Instrument [Line Items]
Long-term debt	500,000
7 1/4% Senior Notes
Debt Instrument [Line Items]
Long-term debt		245,237	245,025
Bank debt
Debt Instrument [Line Items]
Long-term debt	1,489,701	1,131,022	1,185,925
Bank debt | Revolving loans
Debt Instrument [Line Items]
Long-term debt	320,000		15,000
Less current portion	320,000
Bank debt | U.S. term loans
Debt Instrument [Line Items]
Long-term debt	520,000	520,000	520,000
Bank debt | Canadian term loans
Debt Instrument [Line Items]
Long-term debt	82,571	79,323	79,194
Bank debt | Euro term loans
Debt Instrument [Line Items]
Long-term debt	432,686	433,825	456,035
Bank debt | Other foreign bank revolving and term loans
Debt Instrument [Line Items]
Long-term debt	134,444	97,874	115,696
Less current portion	$ 103,300