Accrued Professional Liabilities - Components of Reserves (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Estimated losses under self-insured programs	$ 26,199
Incurred but not reported losses	31,342
Total accrued professional liabilities	57,541us-gaap_SelfInsuranceReserve	53,785us-gaap_SelfInsuranceReserve
Less estimated losses payable within one year	10,957us-gaap_SelfInsuranceReserveCurrent
Total	$ 46,584us-gaap_SelfInsuranceReserveNoncurrent

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_SelfInsuranceReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant