Commitments and Contingencies - Schedule of Contractual Obligations, Commitments and Contingencies (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Long-Term Debt [Member]
Commitment And Contingencies [Line Items]
Payments due in 1 year	$ 924
Payments due in 2 years	907
Payments due in 3 years	2,343
Payments due in 4 years	675
Payments due in 5+ years	13,763
Contractual Obligation, Commitments and Contingencies	18,612
Operating Leases [Member]
Commitment And Contingencies [Line Items]
Payments due in 1 year	846
Payments due in 2 years	435
Payments due in 3 years	107
Payments due in 4 years	61
Payments due in 5+ years	17
Contractual Obligation, Commitments and Contingencies	1,466
Physician Guarantees [Member]
Commitment And Contingencies [Line Items]
Payments due in 1 year	27
Payments due in 2 years	20
Payments due in 3 years	0
Payments due in 4 years	0
Payments due in 5+ years	0
Contractual Obligation, Commitments and Contingencies	47
Interest on Outstanding Debt [Member]
Commitment And Contingencies [Line Items]
Payments due in 1 year	1,065
Payments due in 2 years	1,005
Payments due in 3 years	890
Payments due in 4 years	782
Payments due in 5+ years	6,891
Contractual Obligation, Commitments and Contingencies	$ 10,633