Earnings Per Common Share (Schedule of Basic Weighted Average Shares Reconciles to Diluted Weighted Average Shares Outstanding) (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accounting Policies [Abstract]
Basic weighted average common shares outstanding (in shares)	79,558	81,259	80,064	81,762
Dilutive effect of stock options, unvested shares, and DCUs (in shares)	1,003	959	1,029	939
Diluted weighted average common shares outstanding (in shares)	80,561	82,218	81,093	82,701