Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Amended Employee Agreement - Stephen Rizzone - Additional Information (Detail)

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Commitments and Contingencies - Amended Employee Agreement - Stephen Rizzone - Additional Information (Detail) - USD ($)
 12 Months Ended
May 21, 2015
Jan. 01, 2015
Dec. 12, 2013
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Commitments And Contingencies [Line Items]            
Share-based compensation arrangement by share-based payment award, options, grants in period, gross       0 0  
Performance based equity plan, market capitalization minimum amount           $ 100,000,000
Performance based equity plan market capitalization maximum amount           $ 1,100,000,000
Performance Based Equity Plan [Member]            
Commitments And Contingencies [Line Items]            
Performance based equity plan, market capitalization minimum amount $ 100,000,000          
Performance share units to be earned on achievement of market capitalization growth 0          
Performance based equity plan market capitalization maximum amount $ 1,100,000,000          
Percentage of performance share units to be earned on achievement of market capitalization growth 100.00%     100.00%   100.00%
Percentage of performance share units to be paid on quarterly basis 50.00%          
Percentage of performance share units deferred 50.00%          
Percentage of performance share units to be paid on termination of employment agreement       25.00%    
Performance Share Units [Member] | Performance Based Equity Plan [Member]            
Commitments And Contingencies [Line Items]            
Share-based compensation arrangement by share-based payment award, options, grants in period, gross 639,075          
Second Employee Stock Option [Member]            
Commitments And Contingencies [Line Items]            
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     496,546      
Deferred compensation arrangement with individual, exercise price     $ 6.00      
Employee Stock Option [Member]            
Commitments And Contingencies [Line Items]            
Share-based compensation arrangement by share-based payment award, options, grants in period, gross       0    
Deferred compensation arrangement with individual, maximum contractual term     48 months      
Deferred compensation arrangement with individual, exercise price     $ 1.68      
Vesting period     4 years      
Mr. Rizzone [Member]            
Commitments And Contingencies [Line Items]            
Agreement effective date   Jan. 01, 2015        
Initial term of agreement   4 years        
Renewal Term   1 year        
Officers' compensation       $ 365,000    
Employment agreement percentage of base salary       100.00%    
Mr. Rizzone [Member] | Employee Stock Option [Member]            
Commitments And Contingencies [Line Items]            
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     275,689      
Deferred compensation arrangement with individual, maximum contractual term     10 years