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Selected Quarterly Financial Information - Summary of Company's Selected Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Net revenue $ 932,696 $ 896,652 $ 915,918 $ 901,857 $ 910,820 $ 868,951 $ 842,944 $ 835,597 $ 3,647,123 $ 3,458,312 $ 3,183,159
Practice salaries and benefits 657,061 625,717 620,980 631,830 617,455 586,476 561,418 572,385 2,535,588 2,337,734 2,031,220
Practice supplies and other operating expenses 29,381 30,159 31,833 30,655 32,353 29,497 30,872 27,796 122,028 120,518 118,416
General and administrative expenses 112,789 102,905 107,908 108,776 108,895 101,430 103,015 103,765 432,378 417,105 372,572
Depreciation and amortization 29,891 28,709 26,518 26,163 26,414 25,116 25,735 25,614 111,281 102,879 89,264
Total operating expenses 829,122 787,490 787,239 797,424 785,117 742,519 721,040 729,560 3,201,275 2,978,236 2,611,472
Income from operations 103,574 109,162 128,679 104,433 125,703 126,432 121,904 106,037 445,848 480,076 571,687
Investment and other income 967 1,302 1,202 1,464 2,777 235 365 576 4,935 3,953 2,019
Interest expense (25,448) (21,782) (21,604) (19,935) (19,844) (18,428) (18,535) (17,752) (88,769) (74,559) (63,092)
Equity (loss) in earnings of unconsolidated affiliate 2,277 1,766 1,257 1,525 (294) (240) 689 797 6,825 952 3,185
Total non-operating expenses (22,204) (18,714) (19,145) (16,946) (17,361) (18,433) (17,481) (16,379) (77,009) (69,654) (57,888)
Income before income taxes 81,370 90,448 109,534 87,487 108,342 107,999 104,423 89,658 368,839 410,422 513,799
Income tax (provision) benefit (21,156) (24,873) (30,122) (24,059) 27,761 (42,119) (40,725) (34,967) (100,210) (90,050) (189,203)
Net income 0 0 0 0         268,629 320,372 324,596
Net loss attributable to noncontrolling interests 0 0 0 0             318
Net income attributable to MEDNAX, Inc. $ 60,214 $ 65,575 $ 79,412 $ 63,428 $ 136,103 $ 65,880 $ 63,698 $ 54,691 $ 268,629 $ 320,372 $ 324,914
Earnings per share, Basic $ 0.69 $ 0.72 $ 0.85 $ 0.68 $ 1.47 $ 0.71 $ 0.69 $ 0.59 $ 2.95 $ 3.47 $ 3.52
Earnings per share, Diluted $ 0.68 $ 0.72 $ 0.85 $ 0.68 $ 1.46 $ 0.71 $ 0.69 $ 0.59 $ 2.93 $ 3.45 $ 3.49
Weighted average shares, Basic 87,810 90,984 92,987 92,859 92,756 92,589 92,181 92,360 91,104 92,431 92,422
Weighted average shares, Diluted 88,258 91,359 93,529 93,505 93,159 92,881 92,812 93,143 91,606 92,958 93,109