| Reconciliation between Basic and Diluted Earnings Per Share | 
        
 
 A reconciliation between basic and diluted earnings per share was
 as follows (in thousands, except share and per share data): 
 
   
 
 
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Three Months Ended 
 September 30,
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 Nine Months Ended
 September 30, | 
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 2013 | 
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 2012 | 
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 2013 | 
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 2012 | 
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 Net income attributable to Norwegian Cruise Line Holdings Ltd. 
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 $ | 
 170,858 | 
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 $ | 
 128,188 | 
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 $ | 
 65,622 | 
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 $ | 
 167,503 | 
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 Net income 
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 $ | 
 172,894 | 
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 $ | 
 128,188 | 
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 $ | 
 66,479 | 
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 $ | 
 167,503 | 
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 Basic weighted-average shares outstanding 
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 204,425,308 | 
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 178,252,763 | 
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 202,279,989 | 
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 178,198,984 | 
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 Dilutive effect of awards 
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 6,277,936 | 
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 797,287 | 
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 6,393,619 | 
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 787,520 | 
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 Diluted weighted-average shares outstanding 
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 210,703,244 | 
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 179,050,050 | 
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 208,673,608 | 
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 178,986,504 | 
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 Basic earnings per share 
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 $ | 
 0.84 | 
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 $ | 
 0.72 | 
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 $ | 
 0.32 | 
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 $ | 
 0.94 | 
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 Diluted earnings per share 
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 $ | 
 0.82 | 
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 $ | 
 0.72 | 
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 $ | 
 0.32 | 
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 $ | 
 0.94 | 
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