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Liquidity - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 14, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Cash and Cash Equivalents [Line Items]          
Cash and cash equivalents including restricted cash $ 62,991   $ 64,977 $ 67,598 $ 86,064
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 $ 20,000      
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.        
Foreign Subsidiaries          
Cash and Cash Equivalents [Line Items]          
Cash and cash equivalents including restricted cash $ 34,400   $ 52,800