Weighted Average Shares Outstanding (Calculation Of Basic And Diluted Earnings Per Share Attributable To Stockholders) (Detail) - shares shares in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding		134,139	142,018	141,431
Dilutive effect of stock options		1,355	1,650	2,044
Diluted weighted average common shares outstanding		135,494	143,668	143,475
Anti-dilutive shares excluded from diluted earnings per share	[1]	156	354	162

[1] Shares were excluded from the dilutive-effect calculation because the outstanding options' exercise prices were greater than the average market price of the Company's common shares during the period.