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Discontinued Operations - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
May 09, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Amortization of convertible note discount $ 3,298,000 $ 4,346,000  
Senior Secured Term Loan      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Amortization of convertible note discount $ 500,000 0  
Operating Segments | Entertainment      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Sell price of business     $ 349,100,000
Interest expense   6,100,000  
Prepayment premium   15,737,000  
Operating Segments | Entertainment | Senior Secured Term Loan      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Amortization of convertible note discount   600,000  
Prepayment premium   $ 15,700,000