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Notes Payable and Credit Agreement - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended
Dec. 05, 2013
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Notes Payable, Other Payables
Mar. 31, 2012
Notes Payable, Other Payables
Mar. 31, 2014
Minimum
Mar. 31, 2014
Maximum
Mar. 31, 2014
Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee
Dec. 05, 2013
Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee
Debt Instrument [Line Items]                  
Revolving credit facility commitment                 $ 125,000,000
Maturity Date Nov. 30, 2018                
Spread on Libor variable rate           1.50% 2.50%    
Spread on base variable rate           0.10% 1.00%    
Percentage of unused commitment fee           0.10% 0.25%    
Payments/Long term debt, Total   46,725,000 41,475,000         45,500,000  
Remaining revolving credit outstanding               79,500,000  
Aggregate amount of Notes Payable       1,300,000 350,000        
Aggregate principal installments       $ 650,000 $ 175,000        
Average effective interest rate       3.25% 3.25%