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Stockholders' Equity - Summary of Unaudited Pro-Forma Adjustments to Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Condensed Balance Sheet Statements Captions [Line Items]    
Total assets $ 1,047,367 $ 911,774
Total liabilities $ 792,039 692,858
Contingently redeemable common stock   $ 19,000
STOCKHOLDERS' EQUITY:    
Cumulative convertible preferred stock, $.01 par value    
Common stock, $.01 par value $ 456 $ 448
Treasury shares, at cost (67,229) (62,153)
Additional paid-in capital 62,845 40,987
Accumulated other comprehensive income (loss), net of taxes (1,721) (1,835)
Retained earnings 260,977 222,469
Total stockholders' equity 255,328 199,916
Total liabilities, contingently redeemable common stock and stockholders' equity $ 1,047,367 911,774
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   218,916
Total liabilities, contingently redeemable common stock and stockholders' equity   $ 911,774