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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
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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

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