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Notes Payable - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Installment
Dec. 31, 2012
Installment
Jul. 31, 2011
Installment
Jun. 30, 2011
Installment
Jul. 31, 2011
Notes Payable, Other Payables [Member]
Jun. 30, 2011
Notes Payable, Other Payables [Member]
Dec. 31, 2013
Notes Payable, Other Payables [Member]
Dec. 31, 2012
Notes Payable, Other Payables [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 05, 2013
Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]
Dec. 31, 2013
Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]
Debt Instrument [Line Items]                        
Revolving credit facility commitment                     $ 125,000,000  
Revolving credit facility maturity date                     Nov. 30, 2018 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%    
Revolving credit outstanding 41,475,000 18,034,000                   40,000,000
Remaining revolving credit outstanding                       85,000,000
Aggregate amount of Notes Payable         200,000 367,272 1,300,000 350,000        
Aggregate principal installments         $ 100,000 $ 183,636 $ 650,000 $ 175,000        
Average effective interest rate         3.25% 3.25% 3.25% 3.25%        
Number of annual installments 2 2 2 2