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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 05, 2019
Mar. 31, 2019
Mar. 31, 2018
Dec. 27, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading of convertible notes, face value, disclosed as a percentage   99.00% 102.00%  
Fixed asset impairment $ 14,958      
Senior Unsecured 5.00% Due 2028        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt   $ 300,000 $ 300,000 $ 300,000
Fair Value, Measurements, Nonrecurring        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of fixed assets   $ 242