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Stockholders' Equity - Summary of Unaudited Pro-Forma Adjustments to Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Condensed Balance Sheet Statements Captions [Line Items]        
Total assets $ 993,548 $ 911,774    
Total liabilities $ 700,456 692,858    
Contingently redeemable common stock   $ 19,000    
STOCKHOLDERS' EQUITY:        
Cumulative convertible preferred stock, $.01 par value    
Common stock, $.01 par value $ 455 $ 448    
Treasury shares, at cost (80,802) (62,153)    
Additional paid-in capital 70,789 40,987    
Accumulated other comprehensive income (loss), net of taxes (4,006) (1,835)    
Retained earnings 306,656 222,469    
Total stockholders' equity [1] 293,092 199,916 $ 175,609 $ 163,514
Total liabilities, contingently redeemable common stock and stockholders' equity $ 993,548 911,774    
Pro-Forma Adjustment [Member]        
Condensed Balance Sheet Statements Captions [Line Items]        
Contingently redeemable common stock   $ (19,000)    
STOCKHOLDERS' EQUITY:        
Cumulative convertible preferred stock, $.01 par value      
Additional paid-in capital   $ 19,000    
Total stockholders' equity   19,000    
Pro-Forma [Member]        
Condensed Balance Sheet Statements Captions [Line Items]        
Total assets   911,774    
Total liabilities   $ 692,858    
STOCKHOLDERS' EQUITY:        
Cumulative convertible preferred stock, $.01 par value      
Common stock, $.01 par value   $ 448    
Treasury shares, at cost   (62,153)    
Additional paid-in capital   59,987    
Accumulated other comprehensive income (loss), net of taxes   (1,835)    
Retained earnings   222,469    
Total stockholders' equity [1]   218,916    
Total liabilities, contingently redeemable common stock and stockholders' equity   $ 911,774    
[1] See “—Note 8 (Stockholders’ Equity)” for an explanation of events subsequent to December 31, 2014 giving rise to pro-forma stockholders’ equity of $218.9 million as of December 31, 2014.