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Segment and Geographic Information - Income from Operations by Segment (Detail) - USD ($)
$ 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
Segment Reporting Information [Line Items]                      
Revenue $ 478,241 $ 471,585 $ 489,699 $ 463,657 $ 439,879 $ 433,316 $ 445,546 $ 422,164 $ 1,903,182 $ 1,740,905 $ 1,569,841
Amortization of intangible assets                 32,569 32,561 29,642
Income from operations $ 63,727 $ 55,460 $ 64,624 $ 55,284 $ 52,266 $ 44,963 $ 56,806 $ 51,404 239,095 205,439 197,238
Operating Segments | Full service center-based child care                      
Segment Reporting Information [Line Items]                      
Revenue                 1,586,323 1,457,754 1,321,699
Income from operations                 152,006 130,289 129,693
Operating Segments | Back-up care                      
Segment Reporting Information [Line Items]                      
Revenue                 245,498 224,264 200,106
Income from operations                 68,462 60,373 57,620
Operating Segments | Educational advisory services                      
Segment Reporting Information [Line Items]                      
Revenue                 71,361 58,887 48,036
Income from operations                 $ 18,627 $ 14,777 $ 9,925