Debt and Average Interest Rates on Debt Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jul. 02, 2011
Debt Disclosure [Line Items]
Contractual debt obligations	$ 1,235,209	$ 1,309,087	$ 1,406,907
Less: Current maturities	(1,193)	(1,168)	(1,289)
Short-term borrowings	(222)	(3,694)	(21,451)
Long-term debt	1,233,794	1,304,225	1,384,167
Commercial Paper
Debt Disclosure [Line Items]
Debt, average interest rate	1.22%
Maturity (Year)	2016
Contractual debt obligations	6,993	3,497
Revolving credit facilities
Debt Disclosure [Line Items]
Debt, average interest rate	1.99%
Maturity (Year)	2016
Contractual debt obligations	205,600	168,500	262,064
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	1.07%
Maturity (Year)	2013
Contractual debt obligations	100,000	205,000	205,000
Public Placement | Fixed Rate
Debt Disclosure [Line Items]
Debt, average interest rate	5.00%
Maturity (Year)	2021
Contractual debt obligations	500,000	500,000	500,000
Capital Lease Obligations
Debt Disclosure [Line Items]
Debt, average interest rate	3.72%
Maturity (Year)	2025
Contractual debt obligations	14,671	15,788	18,362
Debt, Other
Debt Disclosure [Line Items]
Debt, average interest rate	3.10%
Contractual debt obligations	$ 7,945	$ 16,302	$ 21,481
Debt, Other | Minimum
Debt Disclosure [Line Items]
Maturity (Year)	2012
Debt, Other | Maximum
Debt Disclosure [Line Items]
Maturity (Year)	2016