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Reconciliation of Weighted Average Shares Used in Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share Disclosure [Line Items]                      
Income (Loss) available to common stockholders                 $ 23,254 $ 21,509 $ (53,906)
Effect of dilutive securities, assumed conversion of convertible senior notes                 7,385 7,345  
Income (Loss) available to common stockholders plus assumed exercises and conversion                 $ 30,639 $ 28,854 $ (53,906)
Earnings per share - basic, Weighted Average Shares                      
Weighted Average Shares, available to common stockholders 18,781 18,559 19,108 19,090 19,570 18,897 21,276 22,003 19,435 20,948 22,200
Effect of dilutive securities:                      
Assumed conversion of convertible senior notes                 23,369 20,388  
Options and warrants                 0 0 0
Earnings per share - diluted, Weighted Average Shares                      
Income (Loss) available to common stockholders plus assumed exercises and conversion, weighted average shares 18,781 42,562 19,108 19,090 44,060 45,152 21,276 22,003 43,321 41,516 22,200
Earnings per share - basic                      
Net income (loss) available to common stockholders, per-share $ (0.50) $ 2.47 $ (0.30) $ (0.40) $ 0.14 $ 2.33 $ (0.43) $ (0.74) $ 1.20 $ 1.03 $ (2.43)
Earnings per share - diluted                      
Income (Loss) available to common stockholders plus assumed exercises and conversion, per-share $ (0.50) $ 1.12 $ (0.30) $ (0.40) $ 0.11 $ 1.03 $ (0.43) $ (0.74) $ 0.71 $ 0.70 $ (2.43)
Options and Warrants                      
Earnings Per Share Disclosure [Line Items]                      
Effect of dilutive securities, Options, warrants,unvested restricted stock grants and unvested performance stock grants                 $ 0 $ 0 $ 0
Restricted Stock                      
Earnings Per Share Disclosure [Line Items]                      
Effect of dilutive securities, Options, warrants,unvested restricted stock grants and unvested performance stock grants                 $ 0 $ 0 $ 0
Effect of dilutive securities:                      
Unvested stock grants                 170 180  
Performance Stock                      
Earnings Per Share Disclosure [Line Items]                      
Effect of dilutive securities, Options, warrants,unvested restricted stock grants and unvested performance stock grants                 $ 0    
Effect of dilutive securities:                      
Unvested stock grants                 347