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Consolidated Statements of Equity (USD $) In Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Noncontrolling Interests [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 1,731,016 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 978 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 724,157 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,005,881 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance, Shares at Dec. 31, 2011 |  | 97,866 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Net income (loss) | 240,907 us-gaap_ProfitLoss |  |  | 240,907 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Common stock issued under employee stock option and stock purchase plan | 28,810 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 13 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 28,797 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Common stock issued under employee stock option and stock purchase plan, shares |  | 1,320 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of restricted stock and vesting of deferred stock |  | 9 md_StockIssuedDuringPeriodValueRestrictedStockAndVestingOfDeferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (9)md_StockIssuedDuringPeriodValueRestrictedStockAndVestingOfDeferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Issuance of restricted stock and vesting of deferred stock, shares |  | 930 md_StockIssuedDuringPeriodSharesRestrictedStockAndVestingOfDeferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock-based compensation expense | 28,437 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 28,437 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Forfeitures of restricted stock | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures |  |  |  |
Forfeitures of restricted stock, shares |  | (78)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Excess tax benefit related to employee stock incentive plans | 6,198 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 6,198 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Balance at Dec. 31, 2012 | 2,035,368 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 787,580 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,246,788 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance, Shares at Dec. 31, 2012 |  | 100,038 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Net income (loss) | 280,517 us-gaap_ProfitLoss |  |  | 280,517 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Common stock issued under employee stock option and stock purchase plan | 28,697 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 14 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 28,683 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Common stock issued under employee stock option and stock purchase plan, shares |  | 1,331 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of restricted stock and vesting of deferred stock |  | 9 md_StockIssuedDuringPeriodValueRestrictedStockAndVestingOfDeferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (9)md_StockIssuedDuringPeriodValueRestrictedStockAndVestingOfDeferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Issuance of restricted stock and vesting of deferred stock, shares |  | 922 md_StockIssuedDuringPeriodSharesRestrictedStockAndVestingOfDeferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock-based compensation expense | 31,288 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 31,288 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Forfeitures of restricted stock | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures |  |  |  |
Forfeitures of restricted stock, shares |  | (28)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Repurchased common stock | (51,863)us-gaap_StockRepurchasedDuringPeriodValue | (11)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (8,570)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (43,282)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Repurchased common stock, shares |  | (1,056)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Excess tax benefit related to employee stock incentive plans | 18,981 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 18,981 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Balance at Dec. 31, 2013 | 2,342,988 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1,012 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 857,953 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,484,023 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance, Shares at Dec. 31, 2013 |  | 101,207 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Contributions from noncontrolling interests | 1,025 md_ContributionsFromNoncontrollingInterest |  |  |  | 1,025 md_ContributionsFromNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Net income (loss) | 317,203 us-gaap_ProfitLoss |  |  | 317,281 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (78)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Common stock issued under employee stock option and stock purchase plan | 42,876 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 13 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 42,863 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Common stock issued under employee stock option and stock purchase plan, shares |  | 1,412 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of restricted stock and vesting of deferred stock |  | 6 md_StockIssuedDuringPeriodValueRestrictedStockAndVestingOfDeferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (6)md_StockIssuedDuringPeriodValueRestrictedStockAndVestingOfDeferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Issuance of restricted stock and vesting of deferred stock, shares |  | 573 md_StockIssuedDuringPeriodSharesRestrictedStockAndVestingOfDeferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of restricted stock for contingent consideration | 705 md_StockIssuedDuringPeriodValueRestrictedStockContingentConsideration |  | 705 md_StockIssuedDuringPeriodValueRestrictedStockContingentConsideration / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Issuance of restricted stock for contingent consideration, shares |  | 12 md_StockIssuedDuringPeriodSharesRestrictedStockContingentConsideration / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock-based compensation expense | 31,719 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 31,719 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Forfeitures of restricted stock | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures |  |  |  |
Forfeitures of restricted stock, shares |  | (34)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Repurchased common stock | (488,429)us-gaap_StockRepurchasedDuringPeriodValue | (71)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (63,836)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (424,522)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Repurchased common stock, shares |  | (7,140)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Excess tax benefit related to employee stock incentive plans | 17,479 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 17,479 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Balance at Dec. 31, 2014 | $ 2,265,566 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 960 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 886,877 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,376,782 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 947 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance, Shares at Dec. 31, 2014 |  | 96,030 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |

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