Annual report pursuant to section 13 and 15(d)

Intangible Assets - Summary of Carrying Amount and Accumulated Amortization of Identifiable Intangible Assets (Detail)

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Intangible Assets - Summary of Carrying Amount and Accumulated Amortization of Identifiable Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Indefinite Lived And Finite Lived Intangible Assets [Line Items]    
Total nonamortizable and amortizable intangible assets, Gross Assets $ 38,620 $ 37,361
Total nonamortizable and amortizable intangible assets, Accumulated Amortization 14,438 11,820
Total nonamortizable and amortizable intangible assets, Net 24,182 25,541
Physician and Customer Relationships [Member]
    
Indefinite Lived And Finite Lived Intangible Assets [Line Items]    
Amortizable intangible assets, Gross Assets 32,865 32,866
Amortizable intangible assets, Accumulated Amortization 12,564 10,373
Amortizable intangible assets, Net 20,301 22,493
Non-Competition Agreements [Member]
    
Indefinite Lived And Finite Lived Intangible Assets [Line Items]    
Amortizable intangible assets, Gross Assets 848 848
Amortizable intangible assets, Accumulated Amortization 621 441
Amortizable intangible assets, Net 227 407
Software [Member]
    
Indefinite Lived And Finite Lived Intangible Assets [Line Items]    
Amortizable intangible assets, Gross Assets 2,907 1,647
Amortizable intangible assets, Accumulated Amortization 1,253 1,006
Amortizable intangible assets, Net 1,654 641
Trade Names [Member]
    
Indefinite Lived And Finite Lived Intangible Assets [Line Items]    
Nonamortizable intangible assets $ 2,000 $ 2,000