Annual report pursuant to Section 13 and 15(d)

Estimated Useful Lives of Assets (Detail)

v2.4.0.8
Estimated Useful Lives of Assets (Detail)
12 Months Ended
Dec. 31, 2013
Ships
 
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 30 years
Buildings | Minimum
 
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 15 years
Buildings | Maximum
 
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 30 years
Computer hardware and software | Minimum
 
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 3 years
Computer hardware and software | Maximum
 
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 5 years
Other property and equipment | Minimum
 
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 3 years
Other property and equipment | Maximum
 
Property, Plant and Equipment [Line Items]  
Property and equipment useful life 40 years
Leasehold improvements
 
Property, Plant and Equipment [Line Items]  
Property and equipment useful life Shorter of lease term or asset life