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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 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting [Abstract]                      
Net income $ 29,061 $ 60,422 $ 64,598 $ 62,645 $ 23,724 $ 44,333 $ 43,609 $ 38,945 $ 216,726 $ 150,611 $ 107,962
Income tax provision (benefit) 10,624 19,857 21,313 19,930 7,834 19,964 14,113 15,270 71,724 57,181 (20,857)
Interest income and other 3,680 (2,973) (2,609) (159) (2,903) (1,400) (2,474) 1,800 (2,061) (4,977) (3,752)
Interest expense $ 4,835 $ 4,832 $ 4,793 $ 4,746 7,076 7,246 6,583 6,244 19,206 27,149 25,358
Gain on sale of business         0 (13,031) 0 0 0 (13,031) 0
Loss on early extinguishment of debt         $ 9,072 $ 0 $ 0 $ 0 0 9,072 0
Unallocated corporate expenses                 98,398 96,595 83,140
Segment depreciation expense                 27,369 27,979 27,112
Amortization of intangible assets                 8,152 8,162 10,563
Segment special charges                 0 0 37,207
Remeasurement of acquisition-related contingent consideration                 0 0 702
Adjusted Segment EBITDA                 $ 439,514 $ 358,741 $ 267,435