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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]                      
Net revenue $ 830,770 $ 828,006 $ 771,759 $ 752,624 $ 741,740 $ 722,273 $ 676,588 $ 639,395 $ 3,183,159 $ 2,779,996 $ 2,438,913
Operating expenses:                      
Practice salaries and benefits 532,952 521,832 484,625 491,811 461,074 450,033 422,803 419,595 2,031,220 1,753,505 1,543,395
Practice supplies and other operating expenses 32,737 31,641 26,992 27,046 26,164 24,007 24,878 23,431 118,416 98,480 89,002
General and administrative expenses 97,049 93,457 92,116 89,950 85,393 80,185 72,401 67,936 372,572 305,915 247,527
Depreciation and amortization 25,254 24,185 20,241 19,584 18,149 16,918 15,549 13,612 89,264 64,228 45,990
Total operating expenses 687,992 671,115 623,974 628,391 590,780 571,143 535,631 524,574 2,611,472 2,222,128 1,925,914
Income from operations 142,778 156,891 147,785 124,233 150,960 151,130 140,957 114,821 571,687 557,868 512,999
Investment and other income 770 221 410 618 751 567 384 142 2,019 1,844 2,728
Interest expense (16,356) (17,215) (15,058) (14,463) (8,493) (6,201) (5,149) (3,267) (63,092) (23,110) (8,891)
Equity in earnings of unconsolidated affiliate 806 796 789 794 777 784 745 821 3,185 3,127 1,780
Total non-operating expenses (14,780) (16,198) (13,859) (13,051) (6,965) (4,850) (4,020) (2,304) (57,888) (18,139) (4,383)
Income before income taxes 127,998 140,693 133,926 111,182 143,995 146,280 136,937 112,517 513,799 539,729 508,616
Income tax provision 49,919 44,272 51,601 43,411 51,581 55,640 52,889 43,928 189,203 204,038 191,413
Net income 78,079 96,421 82,325 67,771 92,414 90,640 84,048 68,589 324,596 335,691 317,203
Net loss attributable to noncontrolling interests   88 102 128 288 141 82 118 318 629 78
Net income attributable to MEDNAX, Inc. $ 78,079 $ 96,509 $ 82,427 $ 67,899 $ 92,702 $ 90,781 $ 84,130 $ 68,707 $ 324,914 $ 336,320 $ 317,281
Net income attributable to MEDNAX, Inc.:                      
Earnings per share, Basic $ 0.84 $ 1.04 $ 0.89 $ 0.74 $ 1.00 $ 0.98 $ 0.91 $ 0.73 $ 3.52 $ 3.61 $ 3.22
Earnings per share, Diluted $ 0.84 $ 1.04 $ 0.89 $ 0.73 $ 0.99 $ 0.97 $ 0.90 $ 0.72 $ 3.49 $ 3.58 $ 3.18
Weighted average common shares:                      
Basic 92,728 92,604 92,182 92,269 92,790 92,949 92,500 94,231 92,422 93,077 98,588
Diluted 93,347 93,146 92,945 93,091 93,536 93,646 93,495 95,325 93,109 93,960 99,887