Earnings per Share - Computation of Basic and Diluted EPS (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Weighted Average Number Of Shares Outstanding Diluted Disclosure Items [Abstract]
Weighted average common shares outstanding — used in calculation of basic EPS	198,765	170,810	198,143	169,674
Weighted average common stock equivalents — options and restricted shares	6,151	8,294	6,453	8,300
Weighted average common and common equivalent shares outstanding — used in calculation of diluted EPS	204,916	179,104	204,596	177,974