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Reconciliation of Weighted Average Shares Used in Computation of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share Disclosure [Line Items]        
Net income available to common stockholders $ 45,845 $ 44,069 $ 32,584 $ 18,711
Effect of dilutive securities, convertible senior notes 1,779 2,442 5,516 5,456
Net income available to common stockholders plus assumed exercises and conversion $ 47,624 $ 46,511 $ 38,100 $ 24,167
Earnings per share - basic, Weighted Average Shares        
Weighted Average Shares, available to common stockholders 18,559 18,897 18,929 20,721
Effect of dilutive securities:        
Convertible senior notes 23,369 26,055 23,369 19,063
Earnings per share - diluted, Weighted Average Shares        
Net income available to common stockholders plus assumed exercises and conversion 42,562 45,152 42,737 39,951
Earnings per share - basic        
Net income available to common stockholders $ 2.47 $ 2.33 $ 1.72 $ 0.90
Earnings per share - diluted        
Net income available to common stockholders plus assumed exercises and conversion $ 1.12 $ 1.03 $ 0.89 $ 0.61
Performance Stock        
Earnings Per Share Disclosure [Line Items]        
Effect of dilutive securities, unvested stock grants $ 0 $ 0 $ 0 $ 0
Effect of dilutive securities:        
Unvested stock grants 409   284  
Restricted Stock        
Earnings Per Share Disclosure [Line Items]        
Effect of dilutive securities, unvested stock grants $ 0 $ 0 $ 0 $ 0
Effect of dilutive securities:        
Unvested stock grants 225 200 155 167