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Liquidity - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Oct. 31, 2018
Sep. 30, 2018
Jun. 14, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents including restricted cash   $ 57,144,000   $ 64,977,000 $ 48,811,000 $ 86,064,000
Great American Capital Partners Finance Co LLC            
Cash and Cash Equivalents [Line Items]            
Term loan matures 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            
Cash and Cash Equivalents [Line Items]            
Secured term loan   $ 20,000,000 $ 20,000,000      
Term loan matures 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.        
Subsequent Event | Corporate Restructuring [Member] | Minimum            
Cash and Cash Equivalents [Line Items]            
Savings from restructuring $ 10,000,000          
Subsequent Event | Corporate Restructuring [Member] | Maximum            
Cash and Cash Equivalents [Line Items]            
Savings from restructuring $ 15,000,000          
Foreign Subsidiaries            
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents including restricted cash   $ 37,300,000   $ 52,800,000