Annual report pursuant to Section 13 and 15(d)

Summary of Interest Rate Swap Agreements Designated as Hedge Agreements (Detail)

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Summary of Interest Rate Swap Agreements Designated as Hedge Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Interest Rate Swaps [Line Items]  
Nominal Amount $ 450,000
Current Liability 5,503 [1]
Long-Term Liability 8,689 [2],[3]
Estimated Total Fair Value at December 31, 2012 14,192
Interest Rate Swap One Agreements
  
Interest Rate Swaps [Line Items]  
Nominal Amount 175,000
Effective Date Dec. 01, 2010
Pay Rate 1.3975%
Receive Rate 1-Month LIBOR
Expiration Date Sep. 01, 2015
Current Liability 1,959 [1]
Long-Term Liability 2,991 [2],[3]
Estimated Total Fair Value at December 31, 2012 4,950
Interest Rate Swap Two Agreements
  
Interest Rate Swaps [Line Items]  
Nominal Amount 175,000
Effective Date Dec. 01, 2010
Pay Rate 1.40%
Receive Rate 1-Month LIBOR
Expiration Date Sep. 01, 2015
Current Liability 1,978 [1]
Long-Term Liability 3,004 [2],[3]
Estimated Total Fair Value at December 31, 2012 4,982
Interest Rate Swap Three Agreements
  
Interest Rate Swaps [Line Items]  
Nominal Amount 100,000
Effective Date Nov. 01, 2011
Pay Rate 1.715%
Receive Rate 1-Month LIBOR
Expiration Date Apr. 01, 2016
Current Liability 1,566 [1]
Long-Term Liability 2,694 [2],[3]
Estimated Total Fair Value at December 31, 2012 $ 4,260
[1] Included in accrued other current liabilities on the consolidated balance sheet as of December 31, 2012.
[2] Balances are presented net of accumulated impairment losses of $214,031 for the U.S. operating segment and $27,622 for the international operating segment.
[3] Included in other long-term liabilities on the consolidated balance sheet as of December 31, 2012.