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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accounting Policies [Abstract]
Basic weighted average common shares outstanding (in shares)	80,106	81,829	80,317	82,013
Dilutive effect of stock options, unvested shares, and DCUs (in shares)	1,043	905	1,045	930
Diluted weighted average common shares outstanding (in shares)	81,149	82,734	81,362	82,943