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Debt - Annual Maturities of Long-Term Debt Excluding Capital Lease Obligations (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Proforma Debt Instrument [Line Items]  
2013   
2014 512,180
2015 545,000
2016   
2017   
Years thereafter   
Total 1,057,180
$925 Million Credit Facility [Member]
 
Proforma Debt Instrument [Line Items]  
2013   
2015 545,000
2016   
2017   
Years thereafter   
Total 545,000
3.75% Convertible Notes Payable [Member]
 
Proforma Debt Instrument [Line Items]  
2013   
2014 360,000
2016   
2017   
Years thereafter   
Total 360,000
6.75% Senior Notes [Member]
 
Proforma Debt Instrument [Line Items]  
2013   
2014 152,180
2016   
2017   
Years thereafter   
Total $ 152,180