Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule Of Significant Accounting Policies [Line Items]
Revenue of all other clients individually	Less than 5%
Largest amount of tax benefit	Greater than 50%
Provision for interest or penalties related to uncertain tax positions	$ 0
Florida Cancer Specialists [Member]
Schedule Of Significant Accounting Policies [Line Items]
Oncology practice combined represented revenue	14.80%	14.30%
Florida [Member] | Sales [Member]
Schedule Of Significant Accounting Policies [Line Items]
Percentage of revenue derived from the State of Florida	30.00%	30.90%