Related Party Revenue (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Related party transactions:
Management fees revenue	$ 5,292	$ 4,902	$ 10,453	$ 9,762
Revenue from related parties	8,375	8,241	16,792	16,922
SAC Holdings
Related party transactions:
Interest income revenue	1,733	1,981	3,652	4,457
Management fees revenue	4,189	3,857	8,263	7,686
Private Mini
Related party transactions:
Interest income revenue	1,349	1,358	2,686	2,703
Management fees revenue	604	573	1,198	1,140
Mercury
Related party transactions:
Management fees revenue	$ 500	$ 472	$ 993	$ 936