Debt and Average Interest Rates on Debt Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Apr. 02, 2011
Debt Disclosure [Line Items]
Contractual debt obligations	$ 1,415,490	$ 1,309,087	$ 808,427
Less: Current maturities	(1,207)	(1,168)	(13)
Short-term borrowings	(19,190)	(3,694)	(6,093)
Long-term debt	1,395,093	1,304,225	802,321
Commercial Paper
Debt Disclosure [Line Items]
Debt, average interest rate	1.22%
Maturity (Year)	2016
Contractual debt obligations	6,645	3,497
Revolving credit facilities
Debt Disclosure [Line Items]
Debt, average interest rate	1.99%
Maturity (Year)	2016
Contractual debt obligations	257,700	168,500	197,300
Private Placement | Fixed Rate
Debt Disclosure [Line Items]
Debt, average interest rate	5.65%
Contractual debt obligations	400,000	400,000	400,000
Private Placement | Fixed Rate | Minimum
Debt Disclosure [Line Items]
Maturity (Year)	2013
Private Placement | Fixed Rate | Maximum
Debt Disclosure [Line Items]
Maturity (Year)	2017
Private Placement | Floating Rate
Debt Disclosure [Line Items]
Debt, average interest rate	1.08%
Contractual debt obligations	205,000	205,000	205,000
Private Placement | Floating Rate | Minimum
Debt Disclosure [Line Items]
Maturity (Year)	2012
Private Placement | Floating Rate | Maximum
Debt Disclosure [Line Items]
Maturity (Year)	2013
Public Placement | Fixed Rate
Debt Disclosure [Line Items]
Debt, average interest rate	5.00%
Maturity (Year)	2021
Contractual debt obligations	500,000	500,000
Capital Lease Obligations
Debt Disclosure [Line Items]
Debt, average interest rate	3.72%
Maturity (Year)	2025
Contractual debt obligations	15,960	15,788
Debt, Other
Debt Disclosure [Line Items]
Debt, average interest rate	2.24%
Contractual debt obligations	$ 30,185	$ 16,302	$ 6,127
Debt, Other | Minimum
Debt Disclosure [Line Items]
Maturity (Year)	2012
Debt, Other | Maximum
Debt Disclosure [Line Items]
Maturity (Year)	2016