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Segment Information - Income from Operations by Segment (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
OperatingSegment
Mar. 31, 2018
USD ($)
Segment Reporting Information [Line Items]    
Number of Operating Segments | OperatingSegment 3  
Revenue $ 501,758 $ 463,657
Income from operations 62,910 55,284
Selling, general and administrative expenses 55,875 50,212
Operating Segments [Member] | Full service center-based child care    
Segment Reporting Information [Line Items]    
Revenue 418,320 392,625
Income from operations 41,530 36,911
Operating Segments [Member] | Back-up Care    
Segment Reporting Information [Line Items]    
Revenue 64,694 54,679
Income from operations 17,117 14,125
Operating Segments [Member] | Educational Advisory Services    
Segment Reporting Information [Line Items]    
Revenue 18,744 16,353
Income from operations 4,263 4,248
General and Administrative Expense [Member]    
Segment Reporting Information [Line Items]    
Selling, general and administrative expenses $ 400 $ 300