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Sale/ Leaseback Arrangements - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2014
Vessel
Sep. 30, 2013
M
Vessel
Jul. 31, 2009
Entity
Vessel
Jun. 30, 2009
Vessel
Entity
Mar. 31, 2006
Vessel
Leases
Dec. 31, 2013
Vessel
Mar. 31, 2014
Mar. 31, 2010
Mar. 31, 2006
Times
M
Leases
Sep. 30, 2013
Sixth Year
Mar. 31, 2010
Five Vessels Sold in June 2009
Mar. 31, 2010
Vessels Sold in July 2009
Mar. 31, 2014
First Two Vessels
M
Mar. 31, 2006
First Two Vessels
Mar. 31, 2014
First Two Vessels
Sixth Year
Mar. 31, 2014
Third and Fourth PSV
Mar. 31, 2006
Third and Fourth PSV
M
Times
Mar. 31, 2014
Third and Fourth PSV
Ninth Year
Mar. 31, 2006
Fifth Vessel
Times
M
Dec. 31, 2013
First Three Vessels
M
Dec. 31, 2013
First Three Vessels
Minimum
Dec. 31, 2013
First Three Vessels
Maximum
Dec. 31, 2013
Fourth Vessel
Dec. 31, 2013
Fourth Vessel
Sixth Year
Dec. 31, 2013
Fourth Vessel
Eighth Year
Dec. 31, 2013
Fourth Vessel
Final Year
Sep. 30, 2012
First PSV
Oct. 31, 2012
Second PSV
Sale Leaseback Transaction [Line Items]                                                        
Number of vessels sold 4 2 6 6   4                                            
Proceeds from sale $ 63,300,000 $ 65,600,000     $ 76,500,000 $ 141,900,000 $ 270,575,000 $ 101,800,000                                        
Deferred gain 30,500,000 31,300,000       36,200,000 30,500,000 39,600,000                                        
Carrying value 32,800,000 34,300,000       105,700,000 32,800,000 62,200,000                                        
Lease expiration date   2020-09                     2021-03     2024-03             2022-12          
Reacquisition percentage of original sales price               75.00%   55.00%         59.00%     53.00%     59.00% 62.00%            
Length of extension period, months   24             12       24       12   12 24                
Expiration date                                 2015     during the quarter ending December 2020                
Reacquisition original sales price                                               43,600,000 34,500,000 2,900,000    
Number of unrelated third-party companies     1 1                                                
Charter hire operating lease terms               5 years                                        
Lease expiration date                     Jun. 30, 2014 Jul. 30, 2014                                
Guaranteed percentage of lease value               84.00%                                        
Penalties if reacquire in years of one and two of five year lease               5.00%                                        
Repurchase of leased vessels             $ 78,800,000                 $ 22,800,000                     $ 8,800,000 $ 8,400,000
Number of vessels to be sold that are under construction         5                                              
Number of Operating Lease         5       5                                      
Length of extension period, years         8 years       8 years                                      
Number of times can extend agreement                 3               3   3                  
Expiration date                           2014         2016                  
Extended expiration date                                 Through calendar year 2018   Through calendar year 2019