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Financial Instruments - Additional Information (Detail)
$ in Thousands
3 Months Ended
Aug. 11, 2014
USD ($)
Jun. 30, 2016
Vessel
Aug. 31, 2014
Logitel Offshore Holding [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Percentage of noncontrolling interest acquired 100.00%   100.00%
Portion of purchase price paid in cash $ 4,000    
Potential additional cash amount for purchase price $ 27,600    
Impaired Asset [Member] | UMS Segment [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Number of vessels | Vessel   2