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Earnings Per Share - Summary of Numerator and Denominator of Basic and Fully Diluted Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income $ 11,333 $ 7,371 $ 24,413 $ 54,771
Less: Income attributable to participating securities (557) (437) (1,158) (3,182)
Basic Earnings Per Share:        
Income allocated to common stockholders, Income (Numerator) $ 10,776 $ 6,934 $ 23,255 $ 51,589
Income allocated to common stockholders, Shares (Denominator) 9,209 9,635 9,395 9,585
Income allocated to common stockholders, Per Share Amount $ 1.17 $ 0.72 $ 2.48 $ 5.38
Diluted Earnings Per Share:        
Income available to common stockholders and assumed conversions, Income (Numerator) $ 11,804 $ 8,066 $ 26,461 $ 54,952
Income available to common stockholders and assumed conversions, Shares (Denominator) 10,718 11,371 10,964 11,347
Income available to common stockholders and assumed conversions, Per Share Amount $ 1.10 $ 0.71 $ 2.41 $ 4.84
Convertible Senior Notes [Member]        
Effect of Dilutive Securities:        
Dilutive Securities, Income (Numerator) $ 1,028 $ 1,132 $ 3,206 $ 3,363
Dilutive Securities, Shares (Denominator) 1,447 1,651 1,507 1,650
Stock Options [Member]        
Effect of Dilutive Securities:        
Dilutive Securities, Income (Numerator) $ 0 $ 0 $ 0 $ 0
Dilutive Securities, Shares (Denominator) 62 85 62 112