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Segment Information - Income from Operations by Segment (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
OperatingSegment
Sep. 30, 2017
USD ($)
Segment Reporting Information [Line Items]        
Number of Operating Segments | OperatingSegment     3  
Revenue $ 471,585 $ 433,316 $ 1,424,941 $ 1,301,026
Income from operations 55,460 44,963 175,368 153,173
Selling, general and administrative expenses 49,427 46,369 152,776 141,384
Operating Segments [Member] | Full service center-based child care        
Segment Reporting Information [Line Items]        
Revenue 387,048 358,094 1,193,794 1,094,911
Income from operations 34,006 24,742 115,857 99,921
Operating Segments [Member] | Backup Dependent Care        
Segment Reporting Information [Line Items]        
Revenue 66,484 60,085 179,985 164,171
Income from operations 16,941 15,886 47,207 43,794
Operating Segments [Member] | Other Educational Advisory Services        
Segment Reporting Information [Line Items]        
Revenue 18,053 15,137 51,162 41,944
Income from operations $ 4,513 4,335 12,304 9,458
General and Administrative Expense [Member]        
Segment Reporting Information [Line Items]        
Selling, general and administrative expenses   $ 3,700 $ 1,900 $ 5,600