Income Taxes - Components of Income from Continuing Operations before Income Taxes and Noncontrolling Shareholders' Interests (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
Income From Continuing Operations Before Income Taxes And Noncontrolling Shareholders Interests [Line Items]
Income from continuing operations before income taxes and noncontrolling shareholders' interests	$ 44,317	$ 36,729	$ 15,109	$ 13,515	$ 11,989	$ 71,660	$ 17,976	$ 12,434	$ 109,672	$ 114,058	$ 243,925
United States
Income From Continuing Operations Before Income Taxes And Noncontrolling Shareholders Interests [Line Items]
Income from continuing operations before income taxes and noncontrolling shareholders' interests									(4,720)	108,838	211,225
Foreign
Income From Continuing Operations Before Income Taxes And Noncontrolling Shareholders Interests [Line Items]
Income from continuing operations before income taxes and noncontrolling shareholders' interests									$ 114,392	$ 5,220	$ 32,700