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Schedule I - Parent Company Only Financial Statements - Statements of Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements Captions [Line Items]                      
Net income available to common stockholders $ (2,338) $ 9,653 $ 27,919 $ 13,674 $ (20,561) $ (6,305) $ 13,972 $ 60,456 $ 48,908 $ 47,562 $ 202,196
Other comprehensive (loss) income, net of tax:                      
Foreign currency translation adjustments                 6,457 (86) (13,543)
Benefit plans                 (1,840) (12,928)  
Total other comprehensive income (loss), net of tax                 4,617 (13,014) (13,543)
Comprehensive income (loss) attributable to common stockholders                 53,080 38,925 190,510
Parent Company [Member]                      
Condensed Financial Statements Captions [Line Items]                      
Net income available to common stockholders                 48,908 47,562 202,196
Other comprehensive (loss) income, net of tax:                      
Foreign currency translation adjustments                 5,382 96 (11,686)
Benefit plans                 (1,210) (8,733)  
Total other comprehensive income (loss), net of tax                 4,172 (8,637) (11,686)
Comprehensive income (loss) attributable to common stockholders                 $ 53,080 $ 38,925 $ 190,510