Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income Per Common Share (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Earnings Per Share [Abstract]
Basic method	187,921,062	193,902,335	[1]	193,409,621	[1]
Dilutive stock options	1,350,336	766,402		1,102,781
Diluted method	189,271,398	194,668,737	[1]	194,512,402	[1]

[1] Reclassified to conform to current presentation.