Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term debt	$ 1,671,316	$ 1,376,259
Less current portion	255,349	87,776
Long-term debt, noncurrent	1,415,967	1,288,483
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
Bank debt
Debt Instrument [Line Items]
Long-term debt	1,171,316	1,131,022
Bank debt | U.S. term loans
Debt Instrument [Line Items]
Long-term debt	520,000	520,000
Bank debt | Canadian term loans
Debt Instrument [Line Items]
Long-term debt	81,389	79,323
Bank debt | Euro term loans
Debt Instrument [Line Items]
Long-term debt	443,406	433,825
Bank debt | Other foreign bank revolving and term loans
Debt Instrument [Line Items]
Long-term debt	$ 126,521	$ 97,874