Long-Term Debt (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Total Debt	$ 1,931,814	$ 1,967,030	$ 1,931,814	$ 1,967,030	$ 1,598,963
Less current portion	482,877	443,982	482,877	443,982	125,130
Long-term debt	1,448,937	1,523,048	1,448,937	1,523,048	1,473,833
Loss on early extinguishment of debt	0	0	0	1,474
Bank debt [Member]
Debt Instrument [Line Items]
Total Debt	1,131,814	1,167,030	1,131,814	1,167,030	798,963
5 1/2% Senior Notes [Member]
Debt Instrument [Line Items]
Total Debt	300,000	300,000	300,000	300,000	300,000
5% Senior Notes [Member]
Debt Instrument [Line Items]
Total Debt	500,000	500,000	500,000	500,000	500,000
Revolving Loan [Member] | Bank debt [Member]
Debt Instrument [Line Items]
Total Debt	$ 357,044	$ 335,148	$ 357,044	$ 335,148	$ 0
Senior Notes [Member] | 5 1/2% Senior Notes [Member]
Debt Instrument [Line Items]
Senior note interest rate (percent)	5.50%	5.50%	5.50%	5.50%	5.50%
Senior Notes [Member] | 5% Senior Notes [Member]
Debt Instrument [Line Items]
Senior note interest rate (percent)	5.00%	5.00%	5.00%	5.00%	5.00%
Bank revolving loans and term loans [Member] | Bank debt [Member]
Debt Instrument [Line Items]
Less current portion	$ 387,600		$ 387,600
U S Term Loans [Member] | Bank debt [Member]
Debt Instrument [Line Items]
Total Debt	365,000	$ 365,000	365,000	$ 365,000	$ 365,000
Canadian Term Loans [Member] | Bank debt [Member]
Debt Instrument [Line Items]
Total Debt	49,582	62,699	49,582	62,699	60,235
Euro Term Loans [Member] | Bank debt [Member]
Debt Instrument [Line Items]
Total Debt	246,576	279,070	246,576	279,070	266,156
Other Foreign Bank Revolving And Term Loans [Member] | Bank debt [Member]
Debt Instrument [Line Items]
Total Debt	113,612	$ 125,113	113,612	$ 125,113	$ 107,572
Less current portion	$ 95,300		$ 95,300