Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

v2.4.0.8
Long-Term Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Revolving Credit Facility
Apr. 17, 2014
Subsequent Event
Mar. 31, 2014
Credit Agreement
Mar. 31, 2014
Senior Notes
Dec. 31, 2013
Senior Notes
Debt Instrument [Line Items]              
Senior notes interest rate 8.50% 8.50%          
Senior notes payment terms Interest on the 8.50% Senior Notes is payable semi-annually in arrears on June 15 and December 15. Interest on the 8.50% Senior Notes is payable semi-annually in arrears on June 15 and December 15.          
Effective interest rate     2.80%     8.40% 8.40%
Senior notes maturity date Jun. 15, 2019            
Credit agreement expiration date         Nov. 08, 2018    
Letters of credit outstanding $ 0.4 $ 0.4          
Revolving bank credit facility borrowing base 800.0     750.0      
Line of credit, borrowing availability $ 520.6