Accounts Receivable and Net Revenue - Additional Information (Detail) - USD ($) $ 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 |
|
Receivables [Abstract] | |||||||||||
Accounts receivable, net | $ 503,999 | $ 495,276 | $ 503,999 | $ 495,276 | |||||||
Net patient service 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 |