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Accrued Expenses - Summary of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Salaries and related costs	$ 11,686	$ 8,941
Group health insurance claims	2,023	991
Credit balances and overpayments due to patients and payors	2,371	1,513
Other	4,545	2,671
Total	$ 20,625	$ 14,116

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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