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Acquisition of GCI - Additional Information (Detail)
Mar. 13, 2018
USD ($)
Vessel
Containership
$ / shares
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Business Acquisition [Line Items]      
Shares issued | shares   1,986,449 0
Series D Preferred Shares [Member]      
Business Acquisition [Line Items]      
Shares issued | shares 1,986,449 1,986,449  
GCI [Member]      
Business Acquisition [Line Items]      
Percentage of interest in acquired entity 89.20%    
Aggregate purchase price | $ $ 498,050,000    
Escrow deposit | $ 10,000,000    
Acquisition-related costs | $ $ 1,910,000    
Identifiable contracts, estimated useful life 5 years 3 months 18 days    
GCI [Member] | Series D Preferred Shares [Member]      
Business Acquisition [Line Items]      
Shares issued | shares 1,986,449    
Right to repurchase of temporary equity shares, commencing date Sep. 13, 2019    
Right to repurchase of temporary equity shares, ending date Oct. 13, 2019    
Price per share at that time of repurchase | $ / shares $ 24.84    
GCI [Member] | 10000 TEU and 14000 TEU Newbuilding Vessels [Member]      
Business Acquisition [Line Items]      
Number of vessels acquired | Vessel 2    
Number of containerships acquired | Containership 18