Summary of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Total	$ 1,200,767	$ 808,448
Less current portion	414,657	15,000
Total long-term debt	786,110	793,448
Receivables Credit Facility
Debt Instrument [Line Items]
Credit facility	109,000	109,000
Senior Credit Facility
Debt Instrument [Line Items]
Credit facility	142,500	150,000
5.75% Senior Notes
Debt Instrument [Line Items]
Senior notes, net of discount	399,657	399,486
6.50% Senior Notes
Debt Instrument [Line Items]
Senior notes, net of discount	149,965	149,962
Senior Notes Three Point Nine Percentage Senior Notes
Debt Instrument [Line Items]
Senior notes, net of discount	$ 399,645

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References+ Details

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References+ Details