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Credit Facilities - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2014
Jul. 31, 2013
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jun. 14, 2018
Line of Credit Facility [Line Items]                
Debt instrument, face amount     $ 160,078,000   $ 160,078,000   $ 156,647,000  
Debt issuance cost               $ 1,400,000
Amortization expense debt issuance     100,000   $ 100,000      
Great American Capital Partners Finance Co LLC                
Line of Credit Facility [Line Items]                
Line of credit facility, maturity date description         The GACP term loan matures upon the earlier of (i) June 14, 2021, (ii) the termination date of the Wells Fargo credit facility, or March 27, 2019, and (iii) the date that is 91 days prior to the maturity of various of the Company’s convertible senior notes due in 2020.      
Great American Capital Partners Finance Co LLC | Term Loan Agreement                
Line of Credit Facility [Line Items]                
Line of credit facility, maturity date description         All then-outstanding borrowings under the Term Loan are due, and the Term Loan terminates, no later than June 14, 2021, unless sooner terminated in accordance with its terms, which includes the date of termination of the Wells Fargo Credit Facility and the date that is 91 days prior to the maturity of the Company's various convertible senior notes due in 2020.      
Loan facility     20,000,000   $ 20,000,000     $ 20,000,000
Percentage of principal amount redeemed         10.00%      
Debt instrument, face amount     $ 20,000,000   $ 20,000,000      
Weighted average interest rate     11.10%   11.10%      
Year One | Great American Capital Partners Finance Co LLC | Term Loan Agreement                
Line of Credit Facility [Line Items]                
Debt prepayment percentage         2.00%      
Year Two | Great American Capital Partners Finance Co LLC | Term Loan Agreement                
Line of Credit Facility [Line Items]                
Debt prepayment percentage         2.00%      
Year Three | Great American Capital Partners Finance Co LLC | Term Loan Agreement                
Line of Credit Facility [Line Items]                
Debt prepayment percentage         1.00%      
Debt instrument, face amount     $ 20,000,000   $ 20,000,000      
London Interbank Offered Rate (LIBOR) | Great American Capital Partners Finance Co LLC | Term Loan Agreement                
Line of Credit Facility [Line Items]                
Additional basis spread         9.00%      
GECC                
Line of Credit Facility [Line Items]                
Line of credit facility maximum borrowing capacity $ 75,000,000              
Line of credit facility, maturity date         Jun. 15, 2018   Mar. 27, 2019  
Amount of credit facility outstanding             $ 5,000,000  
Stand by letters of credit outstanding amount     $ 13,400,000   $ 13,400,000   20,000,000  
Line of credit facility, maturity date description         The amounts outstanding under the Credit Facility, as amended, are payable in full upon maturity of the facility on March 27, 2019, except that the Credit Facility would mature on June 15, 2018 if the Company does not refinance or extend the maturity of the convertible senior notes that mature in 2018, provided that any such refinancing or extension shall have a maturity date that is no sooner than six months after the stated maturity of the Credit Facility (i.e., on or about September 27, 2019).      
Rate of credit facility     3.79% 3.79% 3.79% 3.79%    
GECC | London Interbank Offered Rate (LIBOR)                
Line of Credit Facility [Line Items]                
Applicable margin spread over base rate 2.25%              
Additional basis spread         1.00%      
GECC | Base Rate                
Line of Credit Facility [Line Items]                
Applicable margin spread over base rate 1.25%              
GECC | Federal Funds Rate                
Line of Credit Facility [Line Items]                
Applicable margin spread over base rate         0.50%      
GECC | Minimum                
Line of Credit Facility [Line Items]                
Percentage of unused credit line fee         0.25%      
GECC | Maximum                
Line of Credit Facility [Line Items]                
Percentage of unused credit line fee         0.50%      
WF Loan Agreement | Minimum                
Line of Credit Facility [Line Items]                
Line of credit facility, total excess availability     $ 10,000,000   $ 10,000,000      
Fixed charge coverage ratio     125.00%   125.00%      
4.25% Convertible Senior Notes (due 2018)                
Line of Credit Facility [Line Items]                
Line of credit facility, maturity date   Aug. 01, 2018            
Debt instrument, face amount   $ 100,000,000 $ 21,178,000   $ 21,178,000   21,178,000  
4.25% Convertible Senior Notes (due 2018) | GECC                
Line of Credit Facility [Line Items]                
Line of credit facility, maturity date         Sep. 27, 2019      
Line of credit facility, total excess availability     $ 21,800,000   $ 21,800,000   $ 14,100,000  
4.25% Convertible Senior Notes (due 2018) | GECC | Letter of Credit                
Line of Credit Facility [Line Items]                
Loan facility $ 35,000,000