Commitments and Contingencies - Schedule of Contractual Obligations, Commitments and Contingencies (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Long-Term Debt [Member]
Commitment And Contingencies [Line Items]
Payments due in 1 year	$ 9,488
Payments due in 2 years	584
Payments due in 3 years	620
Payments due in 4 years	653
Payments due in 5+ years	4,579
Contractual Obligation, Commitments and Contingencies	15,924
Subordinated Long-Term Debt [Member]
Commitment And Contingencies [Line Items]
Payments due in 1 year	300
Payments due in 2 years	300
Payments due in 3 years	1,702
Payments due in 4 years	0
Payments due in 5+ years	0
Contractual Obligation, Commitments and Contingencies	2,302
Operating Leases [Member]
Commitment And Contingencies [Line Items]
Payments due in 1 year	1,061
Payments due in 2 years	501
Payments due in 3 years	181
Payments due in 4 years	66
Payments due in 5+ years	30
Contractual Obligation, Commitments and Contingencies	1,839
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	394
Payments due in 2 years	337
Payments due in 3 years	328
Payments due in 4 years	319
Payments due in 5+ years	4,009
Contractual Obligation, Commitments and Contingencies	5,387
Interest on Outstanding Subordinated Debt [Member]
Commitment And Contingencies [Line Items]
Payments due in 1 year	172
Payments due in 2 years	148
Payments due in 3 years	68
Payments due in 4 years	0
Payments due in 5+ years	0
Contractual Obligation, Commitments and Contingencies	$ 388