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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Net income (loss) $ 43,609 $ (5,156) $ 82,554 $ 8,860
Add back:        
Income tax provision 14,113 527 29,383 8,404
Interest income and other (2,474) (1,592) (674) (2,197)
Interest expense 6,583 6,250 12,827 12,051
Total Adjusted Segment EBITDA 97,339 58,886 192,620 114,903
Segment Reconciling Items        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Net income (loss) 43,609 (5,156) 82,554 8,860
Add back:        
Income tax provision 14,113 527 29,383 8,404
Interest income and other (2,474) (1,592) (674) (2,197)
Interest expense 6,583 6,250 12,827 12,051
Unallocated corporate expenses 25,882 22,286 49,770 41,339
Segment depreciation expense 7,574 6,783 14,438 13,999
Amortization of intangible assets 2,052 2,422 4,322 4,915
Segment Reporting Special Charges Amount 0 26,830 0 26,830
Remeasurement of acquisition-related contingent consideration 0 536 0 702
Total Adjusted Segment EBITDA $ 97,339 $ 58,886 $ 192,620 $ 114,903