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Accounts Receivable and Net Revenue - Additional Information (Detail) - USD ($)
$ 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
Receivables [Abstract]                      
Accounts receivable, net $ 495,276       $ 444,737       $ 495,276 $ 444,737  
Net patient service 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