Long-Term Debt Summary of Long-Term Debt (Detail)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 Bank Borrowings [Member] USD ($)	Dec. 31, 2013 Bank Borrowings [Member] USD ($)	Dec. 31, 2014 Revolving And Term Loans [Member] USD ($)	Dec. 31, 2014 Bank revolving loans [Member]	Dec. 31, 2013 Bank revolving loans [Member]	Dec. 31, 2012 Bank revolving loans [Member]	Dec. 31, 2014 Bank revolving loans [Member] Bank Borrowings [Member] USD ($)	Dec. 31, 2013 Bank revolving loans [Member] Bank Borrowings [Member] USD ($)	Dec. 31, 2014 U.S. term loans [Member] Bank Borrowings [Member] USD ($)	Dec. 31, 2013 U.S. term loans [Member] Bank Borrowings [Member] USD ($)	Dec. 31, 2014 Canadian term loans [Member] CAD	Dec. 31, 2014 Canadian term loans [Member] Bank Borrowings [Member] USD ($)	Dec. 31, 2013 Canadian term loans [Member] Bank Borrowings [Member] USD ($)	Dec. 31, 2014 Euro term loans [Member] Bank Borrowings [Member] USD ($)	Dec. 31, 2013 Euro term loans [Member] Bank Borrowings [Member] USD ($)	Dec. 31, 2014 Other foreign bank revolving and term loans [Member] USD ($)	Dec. 31, 2014 Other foreign bank revolving and term loans [Member] Bank Borrowings [Member] USD ($)	Dec. 31, 2013 Other foreign bank revolving and term loans [Member] Bank Borrowings [Member] USD ($)	Dec. 31, 2012 Other foreign bank revolving and term loans [Member] Bank Borrowings [Member]	Dec. 31, 2014 Term Loan [Member] USD ($)	Dec. 31, 2014 5½% Senior Notes [Member] USD ($)	Dec. 31, 2013 5½% Senior Notes [Member] USD ($)	Sep. 09, 2013 5½% Senior Notes [Member]	Dec. 31, 2014 5% Senior Notes due 2020 [Member] USD ($)	Dec. 31, 2013 5% Senior Notes due 2020 [Member] USD ($)	Mar. 23, 2012 5% Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate						1.70%	1.90%	1.70%											3.90%	3.80%	3.70%
Line of Credit Facility, Remaining Borrowing Capacity					$ 962,600,000								15,000,000
Long-term debt	1,598,963,000	1,703,836,000	798,963,000	903,836,000					0	0	365,000,000	364,000,000		60,235,000	64,485,000	266,156,000	323,704,000		107,572,000	151,647,000			300,000,000	300,000,000		500,000,000	500,000,000
Less current portion	125,130,000	146,174,000
Long-term debt	1,473,833,000	1,557,662,000
Stated interest rate																									5.50%			5.00%
Long-term debt, due in the next twelve months	125,130,000																	90,500,000				34,600,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	75,565,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	72,164,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	72,164,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	3,025,000
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five	$ 1,250,915,000