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Intangible Assets, Net - Amortization of Referral Relationships and Non Competition Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Referral relationships [Member]
 
Finite Lived Intangible Assets Amortization [Line Items]  
2013 $ 498
2014 462
2015 441
2016 441
2017 441
2018 405
2019 368
2020 361
2021 336
2022 288
2023 180
2024 80
Non compete agreements [Member]
 
Finite Lived Intangible Assets Amortization [Line Items]  
2013 341
2014 180
2015 180
2016 118
2017 73
2018 $ 20