Earnings Per Share - Reconciliation of Weighted Average Share for Basic and Diluted Share Computations (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Weighted average shares outstanding for basic net earnings per share	173,000,000	168,400,000	171,500,000	168,700,000
Effect of dilutive stock options and other equity awards	0	2,600,000	2,700,000	2,700,000
Weighted average shares outstanding for diluted net earnings per share	173,000,000	171,000,000	174,200,000	171,400,000