Long-Term Debt (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Total Debt	$ 1,984,089	$ 2,017,472	$ 1,984,089	$ 2,017,472	$ 1,598,963
Less current portion	532,639	463,112	532,639	463,112	125,130
Long-term debt	1,451,450	1,554,360	1,451,450	1,554,360	1,473,833
Loss on early extinguishment of debt	0	0	0	1,474
Bank debt [Member]
Debt Instrument [Line Items]
Total Debt	1,184,089	1,217,472	1,184,089	1,217,472	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	$ 407,000	$ 350,924	$ 407,000	$ 350,924	$ 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	$ 437,600		$ 437,600
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	53,493	65,506	53,493	65,506	60,235
Euro Term Loans [Member] | Bank debt [Member]
Debt Instrument [Line Items]
Total Debt	246,994	300,410	246,994	300,410	266,156
Other Foreign Bank Revolving And Term Loans [Member] | Bank debt [Member]
Debt Instrument [Line Items]
Total Debt	111,602	$ 135,632	111,602	$ 135,632	$ 107,572
Less current portion	$ 95,000		$ 95,000