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Schedule I - Condensed Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash Flows From Operating Activities:      
Net income $ 168,353 $ 227,497 $ 234,196
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Change in other accrued liabilities (15,726) (15,297) 5,608
Equity in net income of subsidiary (168,353) (227,497) (234,196)
Net cash provided by operating activities 380,085 480,139 504,916
Cash Flows From Investing Activities:      
Net cash used in investing activities (217,489) (248,505) (305,607)
Cash Flows From Financing Activities:      
Purchase of treasury stock, including related excise tax paid (160,413) (482,922) (17,861)
Exercise of stock options 1,133 1,792 2,940
Net cash used in financing activities (178,727) (362,663) (34,707)
Change in Cash and Cash Equivalents, including Restricted Cash (16,131) (131,029) 164,602
Cash and Cash Equivalents, including Restricted Cash—Beginning of year 115,893 246,922 82,320
Cash and Cash Equivalents, including Restricted Cash—End of year 99,762 115,893 246,922
Supplemental Disclosures of Noncash Financing Activities      
Excise tax accrued on treasury stock repurchase 1,455 4,608  
Parent Company [Member]      
Cash Flows From Operating Activities:      
Net income 168,353 227,497 234,196
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Change in accounts receivable from subsidiary (1,174)    
Change in other accrued liabilities 1,174    
Equity in net income of subsidiary (168,353) (227,497) (234,196)
Cash Flows From Investing Activities:      
Capital contributed to subsidiary from exercises of stock options (1,289) (1,691) (2,884)
Net cash used in investing activities (1,289) (1,691) (2,884)
Cash Flows From Financing Activities:      
Dividend received from subsidiary - return of capital, APIC 160,413 482,922  
Purchase of treasury stock, including related excise tax paid (160,413) (482,922)  
Exercise of stock options 1,133 1,792 2,940
Net cash used in financing activities 1,133 1,792 2,940
Change in Cash and Cash Equivalents, including Restricted Cash (156) 101 56
Cash and Cash Equivalents, including Restricted Cash—Beginning of year 161 60 4
Cash and Cash Equivalents, including Restricted Cash—End of year 5 161 60
Supplemental Disclosures of Noncash Financing Activities      
Dividends from subsidiary- return of capital, for purchase of treasury stock 0 0 17,861
Excise tax accrued on treasury stock repurchase 1,455 4,608  
Treasury stock purchases not yet settled in other accrued liabilities 1,174    
Parent Company [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]      
Cash Flows From Operating Activities:      
Net income 168,353 227,497 234,196
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Equity in net income of subsidiary $ (168,353) $ (227,497) $ (234,196)