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Acquisition of SPT - Summarized Consolidated Pro forma Financial Information (Detail) - Ship to Ship Transfer Business [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Revenues $ 549,893 $ 304,523
Net income $ 174,275 $ 53,269
Earnings per common share:    
Basic (in dollars per share) $ 1.30 $ 0.58
Diluted (in dollars per share) $ 1.30 $ 0.57