Related Party Revenue (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Related party transactions:
Management fees revenue	$ 7,133	$ 6,085	$ 17,586	$ 15,847
Revenue from related parties	10,211	9,422	27,003	26,344
SAC Holdings
Related party transactions:
Interest income revenue	1,730	1,981	5,382	6,438
Management fees revenue	3,977	3,585	12,240	11,271
Private Mini
Related party transactions:
Interest income revenue	1,347	1,356	4,033	4,059
Management fees revenue	614	580	1,812	1,720
Mercury
Related party transactions:
Management fees revenue	$ 2,543	$ 1,920	$ 3,536	$ 2,856