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Acquisitions - Consolidated Pro Forma Financial Information (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2014
USD ($)
$ / shares
ALP Maritime Services B.V. [Member]  
Business Acquisition [Line Items]  
Revenues | $ $ 1,019,674
Net income from continuing operations | $ $ 17,495
Limited partners' interest in net income from continuing operation per common unit: - Basic (in dollars per share) | $ / shares $ (0.23)
Limited partners' interest in net income from continuing operation per common unit: - Diluted (in dollars per share) | $ / shares $ (0.23)
Logitel Offshore Holding [Member]  
Business Acquisition [Line Items]  
Revenues | $ $ 1,019,539
Net income from continuing operations | $ $ 16,717
Limited partners' interest in net income from continuing operation per common unit: - Basic (in dollars per share) | $ / shares $ (0.24)
Limited partners' interest in net income from continuing operation per common unit: - Diluted (in dollars per share) | $ / shares $ (0.24)