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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]                      
Net revenue $ 910,820 $ 868,951 $ 842,944 $ 835,597 $ 830,770 $ 828,006 $ 771,759 $ 752,624 $ 3,458,312 $ 3,183,159 $ 2,779,996
Operating expenses:                      
Practice salaries and benefits 617,455 586,476 561,418 572,385 532,952 521,832 484,625 491,811 2,337,734 2,031,220 1,753,505
Practice supplies and other operating expenses 32,353 29,497 30,872 27,796 32,737 31,641 26,992 27,046 120,518 118,416 98,480
General and administrative expenses 108,895 101,430 103,015 103,765 97,049 93,457 92,116 89,950 417,105 372,572 305,915
Depreciation and amortization 26,414 25,116 25,735 25,614 25,254 24,185 20,241 19,584 102,879 89,264 64,228
Total operating expenses 785,117 742,519 721,040 729,560 687,992 671,115 623,974 628,391 2,978,236 2,611,472 2,222,128
Income from operations 125,703 126,432 121,904 106,037 142,778 156,891 147,785 124,233 480,076 571,687 557,868
Investment and other income 2,777 235 365 576 770 221 410 618 3,953 2,019 1,844
Interest expense (19,844) (18,428) (18,535) (17,752) (16,356) (17,215) (15,058) (14,463) (74,559) (63,092) (23,110)
Equity in earnings of unconsolidated affiliates (294) (240) 689 797 806 796 789 794 952 3,185 3,127
Total non-operating expenses (17,361) (18,433) (17,481) (16,379) (14,780) (16,198) (13,859) (13,051) (69,654) (57,888) (18,139)
Income before income taxes 108,342 107,999 104,423 89,658 127,998 140,693 133,926 111,182 410,422 513,799 539,729
Income tax provision 27,761 (42,119) (40,725) (34,967) (49,919) (44,272) (51,601) (43,411) (90,050) (189,203) (204,038)
Net income         78,079 96,421 82,325 67,771 320,372 324,596 335,691
Net loss attributable to noncontrolling interests           88 102 128   318 629
Net income attributable to MEDNAX, Inc. $ 136,103 $ 65,880 $ 63,698 $ 54,691 $ 78,079 $ 96,509 $ 82,427 $ 67,899 $ 320,372 $ 324,914 $ 336,320
Net income attributable to MEDNAX, Inc.:                      
Earnings per share, Basic $ 1.47 $ 0.71 $ 0.69 $ 0.59 $ 0.84 $ 1.04 $ 0.89 $ 0.74 $ 3.47 $ 3.52 $ 3.61
Earnings per share, Diluted $ 1.46 $ 0.71 $ 0.69 $ 0.59 $ 0.84 $ 1.04 $ 0.89 $ 0.73 $ 3.45 $ 3.49 $ 3.58
Weighted average common shares:                      
Basic 92,756 92,589 92,181 92,360 92,728 92,604 92,182 92,269 92,431 92,422 93,077
Diluted 93,159 92,881 92,812 93,143 93,347 93,146 92,945 93,091 92,958 93,109 93,960