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Summary of Grant Date Fair Value and Stock Price of Awards Issued Based on Valuation Assumptions (Detail) - $ / shares
Oct. 15, 2018
Feb. 23, 2016
Jan. 07, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Risk free interest rate     1.21%
Expected dividend yield used when simulating the total shareholder return     0.00%
Expected dividend yield used when simulating the Company's stock price     0.00%
Stock price volatility, minimum     21.09%
Stock price volatility, maximum     72.17%
Mr. Haugh      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Risk free interest rate   0.90%  
Expected dividend yield used when simulating the total shareholder return   0.00%  
Expected dividend yield used when simulating the Company's stock price   0.00%  
Stock price volatility, minimum   24.23%  
Stock price volatility, maximum   74.33%  
Robert C. Galvin      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Risk free interest rate 2.92%    
Expected dividend yield used when simulating the total shareholder return 0.00%    
Expected dividend yield used when simulating the Company's stock price 0.00%    
Stock price volatility, minimum 20.88%    
Stock price volatility, maximum 108.81%    
Minimum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning average stock price     $ 4.85
Valuation date stock price     $ 4.53
Correlation coefficients     0.04%
Minimum | Mr. Haugh      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning average stock price   $ 4.86  
Valuation date stock price   $ 5.52  
Correlation coefficients   0.06%  
Minimum | Robert C. Galvin      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning average stock price $ 0.27    
Valuation date stock price $ 0.22    
Correlation coefficients (0.02%)    
Maximum      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning average stock price     $ 63.41
Valuation date stock price     $ 59.08
Correlation coefficients     0.47%
Maximum | Mr. Haugh      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning average stock price   $ 66.71  
Valuation date stock price   $ 69.92  
Correlation coefficients   0.50%  
Maximum | Robert C. Galvin      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Beginning average stock price $ 86.49    
Valuation date stock price $ 80.27    
Correlation coefficients 0.48%