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Segment Reporting - Reconciliation of Net Income to Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Net income $ 44,333 $ 32,214 $ 126,887 $ 41,074
Add back:        
Income tax provision 19,964 9,197 49,347 17,601
Interest income and other (1,400) (1,103) (2,074) (3,300)
Gain on sale of business (13,031) 0 (13,031) 0
Interest expense 7,246 6,760 20,073 18,811
Total Adjusted Segment EBITDA 94,281 75,380 286,901 190,283
Segment Reconciling Items        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Net income 44,333 32,214 126,887 41,074
Add back:        
Income tax provision 19,964 9,197 49,347 17,601
Interest income and other (1,400) (1,103) (2,074) (3,300)
Gain on sale of business (13,031) 0 (13,031) 0
Interest expense 7,246 6,760 20,073 18,811
Unallocated corporate expenses 27,806 18,827 77,576 60,166
Segment depreciation expense 7,388 6,603 21,826 20,602
Amortization of intangible assets 1,975 2,882 6,297 7,797
Segment special charges 0 0 0 26,830
Remeasurement of acquisition-related contingent consideration 0 0 0 702
Total Adjusted Segment EBITDA $ 94,281 $ 75,380 $ 286,901 190,283
Unallocated Corporate | Segment Reconciling Items        
Add back:        
Unallocated corporate expenses       $ 3,200