Restructuring Charges Incurred by Segment and Cost Type (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Sep. 30, 2015	Sep. 30, 2015
Restructuring Cost And Reserve [Line Items]
Restructuring charges	[1]	$ 7,586	$ 7,586
Americas | Crew Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		3,410	3,410
Americas | Other Vessel Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		203	203
Asia/Pacific | Crew Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		$ 3,973	$ 3,973

[1] Refer to Note (14) for additional information regarding the restructuring charge.