Related Party Revenue (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Related party transactions:
Management fees revenue	$ 24,493	$ 24,378	$ 23,266
Revenue from related parties	36,931	38,135	48,061
Sac Holdings [Member]
Related party transactions:
Interest income revenue	7,071	8,373	19,364
Management fees revenue	18,008	18,732	18,306
Private Mini [Member]
Related party transactions:
Interest income revenue	5,348	5,383	5,431
Management fees revenue	2,437	2,305	2,226
Mercury [Member]
Related party transactions:
Management fees revenue	$ 4,049	$ 3,342	$ 2,734