Net Income per Share (Net Income Per Basic and Diluted Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator
Income used to compute net income per diluted share	$ 7,241	$ 55,887
Denominator
Total weighted-average shares used to compute net income per basic share (in Shares)	163,745	163,701
Diluted (in Shares)	163,992	163,835
Basic (in Dollars per Share)	$ 0.04	$ 0.34
Net income per diluted share (in Dollars per Share)	$ 0.04	$ 0.34
Restricted Stock [Member]
Debt Instrument [Line Items]
Additional shares included in the calculation of diluted EPS (in Shares)	247	134