Annual report pursuant to Section 13 and 15(d)

Fair Value of Financial Instruments - Fair Values and Related Carrying Values of Debt Instruments (Detail)

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Fair Value of Financial Instruments - Fair Values and Related Carrying Values of Debt Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Carrying Amount [Member]
   
Long-term Debt    
Long-term Debt $ 650,000 $ 425,000
Carrying Amount [Member] | 7.50% Senior Notes, due August 2020 (Issued July 30, 2013) [Member]
   
Long-term Debt    
Long-term Debt 225,000 0
Carrying Amount [Member] | 9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
   
Long-term Debt    
Long-term Debt 425,000 425,000
Fair Value [Member]
   
Long-term Debt    
Long-term Debt 682,500 453,688
Fair Value [Member] | 7.50% Senior Notes, due August 2020 (Issued July 30, 2013) [Member]
   
Long-term Debt    
Long-term Debt 236,250 0
Fair Value [Member] | 9.125% Senior Notes, due April 2018 (Issued April 25, 2012) [Member]
   
Long-term Debt    
Long-term Debt $ 446,250 $ 453,688