Earnings Per Share - Reconciliation of Basic and Diluted Weighted - Average Shares Outstanding (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	131,491,182	138,293,052	132,322,704	139,326,368
Weighted average dilutive options outstanding	1,823,640	1,652,852	1,856,496	1,739,299
Diluted weighted average shares outstanding	133,314,822	139,945,904	134,179,200	141,065,667
Antidilutive shares	0	19,038	0	9,572