Schedule of Basic and Diluted Shares (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Basic	176,004	145,138	175,143	143,920
Effect of dilutive securities		1,959
Diluted shares	176,004	147,097	175,143	143,920