Annual report pursuant to Section 13 and 15(d)

Summary of Quarterly Financial Data (Unaudited) - Additional Information (Detail)

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Summary of Quarterly Financial Data (Unaudited) - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Jun. 30, 2013
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Unaudited Quarterly Financial Data [Line Items]              
Loss on extinguishment of debt   $ 28,200,000 $ 17,100,000 $ 2,600,000 $ (28,238,000) $ (19,713,000) $ (1,107,000)
Interest on notes           5.00% 5.00%
Net income includes impairment charges 9,900,000       9,872,000 440,000 200,000
5.0 % Convertible Notes and 7.0% Senior Subordinated Notes Due 2022 [Member]
              
Condensed Unaudited Quarterly Financial Data [Line Items]              
Incremental interest incurred charge     1,200,000        
5.0 % Convertible Notes [Member]
              
Condensed Unaudited Quarterly Financial Data [Line Items]              
Interest on notes     5.00%        
7.0% Notes [Member]
              
Condensed Unaudited Quarterly Financial Data [Line Items]              
Interest on notes     7.00%        
9% Notes [Member]
              
Condensed Unaudited Quarterly Financial Data [Line Items]              
Incremental interest incurred charge   $ 800,000          
Interest on notes   9.00%          
5% Notes [Member]
              
Condensed Unaudited Quarterly Financial Data [Line Items]              
Interest on notes   5.00%