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Common Stock - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended
Mar. 31, 2009
Mar. 31, 2014
Dec. 31, 2008
Statement Of Partners Capital [Abstract]      
Common stock authorized by the Board of Directors     2,250,000
Maximum percentage of repurchase of common stock 10.00%    
Repurchase of common stock 1,200,000    
Bank credit agreement to permit share repurchases of common stock $ 15,000,000    
Total purchased shares 859,499 0  
Additional estimated shares 340,501