Leases Annual Commitments (Detail) (USD $)	Mar. 31, 2013
Schedule of Operating Leases [Line Items]
Operating leases future minimum payments due in 2014	$ 672
Operating leases future minimum payments due in 2015	231
Operating leases future minimum payments due in 2016	111
Operating leases future minimum payments due in 2017	25
Operating leases future minimum payments due thereafter
Operating leases future minimum payments due	1,039
Affiliate
Schedule of Operating Leases [Line Items]
Operating leases future minimum payments due in 2014
Operating leases future minimum payments due in 2015
Operating leases future minimum payments due in 2016
Operating leases future minimum payments due in 2017
Operating leases future minimum payments due thereafter
Operating leases future minimum payments due
Non-Affiliate
Schedule of Operating Leases [Line Items]
Operating leases future minimum payments due in 2014	672
Operating leases future minimum payments due in 2015	231
Operating leases future minimum payments due in 2016	111
Operating leases future minimum payments due in 2017	25
Operating leases future minimum payments due thereafter
Operating leases future minimum payments due	$ 1,039