Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Summary of Company's Current Debt Portfolio (Detail)

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Long-Term Debt - Summary of Company's Current Debt Portfolio (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total debt $ 585,000 $ 615,000
Current portion of long-term debt 0 10,000
Long-term debt 585,000 605,000
6.75% Senior Notes, due July 2022 [Member]    
Debt Instrument [Line Items]    
Total debt 360,000 360,000
7.50% Senior Notes, due August 2020 [Member]    
Debt Instrument [Line Items]    
Total debt 225,000 225,000
Term Note Due December 2017 [Member]    
Debt Instrument [Line Items]    
Total debt $ 0 $ 30,000