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Long term debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
7.75% senior notes $ 610,000 $ 610,000
Less: Current portion of long-term debt 0 0
Long-term debt, net 2,487,239 2,485,127
Term Loan and Securitization Facility:    
Debt Instrument [Line Items]    
Less: term loan discount (26,636) (28,748)
Total Term Loan and Securitization Facility 1,877,239 1,875,127
7.75% senior notes    
Debt Instrument [Line Items]    
7.75% senior notes 610,000 610,000
Term loan | Term Loan and Securitization Facility:    
Debt Instrument [Line Items]    
Term Loan and Securitization Facility: 1,903,875 1,903,875
Securitization facility | Term Loan and Securitization Facility:    
Debt Instrument [Line Items]    
Term Loan and Securitization Facility: $ 0 $ 0