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Intangible Assets, Net - Amortization of Referral Relationships and Non Competition Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Referral relationships [Member]
 
Finite-Lived Intangible Assets [Line Items]  
2014 $ 461
2015 440
2016 440
2017 440
2018 404
2019 367
2020 367
2021 367
2022 318
2023 211
2024 108
2025 31
2026 5
Non competition agreements [Member]
 
Finite-Lived Intangible Assets [Line Items]  
2014 207
2015 207
2016 144
2017 100
2018 43
2019 $ 4