v3.5.0.2
Shipbuilding Contracts - Additional Information (Detail)
DWT in Thousands, $ in Millions
 1 Months Ended 2 Months Ended
Feb. 15, 2016
USD ($)
Apr. 30, 2013
Contract
Vessel
DWT
Nov. 30, 2013
Vessel
Mar. 31, 2016
USD ($)
Nov. 30, 2014
USD ($)
Property, Plant and Equipment [Line Items]          
Number of special purpose subsidiaries   4      
STX Offshore And Shipbuilding Co., Ltd [Member]          
Property, Plant and Equipment [Line Items]          
Weight capacity in dead-weight tonnes | DWT   113      
Number Of Shipbuilding Contracts | Contract   4      
Litigation settlement, amount | $ $ 32.4        
STX Offshore And Shipbuilding Co., Ltd [Member] | Cash and cash equivalents [Member]          
Property, Plant and Equipment [Line Items]          
Amount of escrow account placed | $       $ 0.6 $ 0.6
STX Offshore And Shipbuilding Co., Ltd [Member] | Orders to Construct Newbuildings [Member]          
Property, Plant and Equipment [Line Items]          
Number of vessels   4      
STX Offshore And Shipbuilding Co., Ltd [Member] | Additional Order Option Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Number of vessels   12      
STX Offshore And Shipbuilding Co., Ltd [Member] | Option To Order Exercised [Member]          
Property, Plant and Equipment [Line Items]          
Number of vessels     8