Long-Term Debt and Other Borrowing Arrangements - Carrying Values of Long-Term Debt and Other Borrowing Arrangements (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Term Loan	$ 232,147	$ 247,714
Revolving credit component
Total senior subordinated notes	1,098,767	705,221
Total debt and other borrowing arrangements	1,330,914	1,151,205
Less current maturities of Term Loan	(23,810)	(15,678)
Long-term debt	1,307,104	1,135,527
Revolving credit component [Member]
Debt Instrument [Line Items]
Revolving credit component		198,270
Senior secured credit facility [Member]
Debt Instrument [Line Items]
Total debt and other borrowing arrangements	232,147	445,984
5.5% Senior subordinated notes due 2022 [Member]
Debt Instrument [Line Items]
Total debt and other borrowing arrangements	700,000	700,000
5.5% Senior subordinated notes due 2023 [Member]
Debt Instrument [Line Items]
Total debt and other borrowing arrangements	393,546
9.25% Senior subordinated notes due 2019 [Member]
Debt Instrument [Line Items]
Total debt and other borrowing arrangements	$ 5,221	$ 5,221