Income Taxes - Components of Income from Continuing Operations before Income Taxes and Noncontrolling Shareholders' Interests (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income From Continuing Operations Before Income Taxes And Noncontrolling Shareholders Interests [Line Items]
Income from continuing operations before income taxes and noncontrolling shareholders' interests	$ 334,028	$ 348,519	$ 212,971
U.S. [Member]
Income From Continuing Operations Before Income Taxes And Noncontrolling Shareholders Interests [Line Items]
Income from continuing operations before income taxes and noncontrolling shareholders' interests	314,263	165,888	107,918
Foreign [Member]
Income From Continuing Operations Before Income Taxes And Noncontrolling Shareholders Interests [Line Items]
Income from continuing operations before income taxes and noncontrolling shareholders' interests	$ 19,765	$ 182,631	$ 105,053