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Earnings Per Share - Additional Information (Detail) - shares
1 Months Ended 3 Months Ended 6 Months Ended
May. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]            
Antidilutive stock options outstanding   174,000 120,000 174,000 131,000  
Shares of common stock issued upon vesting of restricted stock   29,000 40,000 399,000 372,000  
Common stock issued 5,750,000          
Convertible Debt [Member] | 1.75% Senior Notes due 2017 [Member]            
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]            
Interest rate   1.75% 1.75% 1.75% 1.75% 1.75%