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Accrued Professional Liability - Schedule of Accrued Professional Liability (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Payables and Accruals [Abstract] |  |  |
Balance at beginning of year | $ 158,691 us-gaap_MalpracticeLossContingencyAccrualUndiscounted | $ 137,036 us-gaap_MalpracticeLossContingencyAccrualUndiscounted | $ 122,847 us-gaap_MalpracticeLossContingencyAccrualUndiscounted
Provision (adjustment) for losses related to Current year | 39,386 md_ProvisionAdjustmentForLossesRelatedToCurrentYear | 41,235 md_ProvisionAdjustmentForLossesRelatedToCurrentYear | 35,441 md_ProvisionAdjustmentForLossesRelatedToCurrentYear
Provision (adjustment) for losses related to Prior years | (16,125)md_ProvisionAdjustmentForLossesRelatedToPriorYear | (8,100)md_ProvisionAdjustmentForLossesRelatedToPriorYear | (8,119)md_ProvisionAdjustmentForLossesRelatedToPriorYear
Total provision for losses | 23,261 md_MalpracticeLossContingencyProvisionForLosses | 33,135 md_MalpracticeLossContingencyProvisionForLosses | 27,322 md_MalpracticeLossContingencyProvisionForLosses
Claim payments related to Current year | (293)us-gaap_MalpracticeLossContingencyClaimsIncurredInPeriod | (741)us-gaap_MalpracticeLossContingencyClaimsIncurredInPeriod | (569)us-gaap_MalpracticeLossContingencyClaimsIncurredInPeriod
Claim payments related to Prior years | (13,290)us-gaap_MalpracticeLossContingencyClaimsIncurredInPriorPeriods | (10,739)us-gaap_MalpracticeLossContingencyClaimsIncurredInPriorPeriods | (12,564)us-gaap_MalpracticeLossContingencyClaimsIncurredInPriorPeriods
Total payments | (13,583)us-gaap_MalpracticeLossContingencyClaimsIncurredNet | (11,480)us-gaap_MalpracticeLossContingencyClaimsIncurredNet | (13,133)us-gaap_MalpracticeLossContingencyClaimsIncurredNet
Balance at end of year | $ 168,369 us-gaap_MalpracticeLossContingencyAccrualUndiscounted | $ 158,691 us-gaap_MalpracticeLossContingencyAccrualUndiscounted | $ 137,036 us-gaap_MalpracticeLossContingencyAccrualUndiscounted

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- Definition Malpractice loss contingency provision for losses. + References No definition available. + Details
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- Definition Provision (adjustment) for losses related to current year. + References No definition available. + Details
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- Definition Provision (adjustment) for losses related to prior year. + References No definition available. + Details
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- Definition Amount of the accrued liability on an undiscounted basis for malpractice claims (including general and professional liability) at the end of the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of loss recognized for asserted and unasserted malpractice claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 450 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6491336&loc=d3e5870-115623 + Details
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- Definition Amount of increase in asserted and unasserted malpractice claims that were originally recognized in a prior period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 450 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6491336&loc=d3e5870-115623 + Details
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- Definition Amount of costs associated with malpractice claims and insurance premiums incurred during an accounting period, less insurance recoveries and returns of previously paid premiums. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 450 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6491336&loc=d3e5870-115623 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 720 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25501930&loc=d3e8578-115644 + Details
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