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Acquisition of Ship-to-Ship Transfer Business - Summarized Consolidated Pro Forma Financial Information (Detail) - Ship to Ship Transfer Business [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Business Acquisition [Line Items]    
Revenues $ 131,558 $ 254,110
Net Income $ 45,771 $ 85,737
Earnings per common share:    
Basic $ 0.37 $ 0.70
Diluted $ 0.37 $ 0.70