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Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 12,072	$ 12,062
Shares of common stock and common stock equivalents:
Weighted average shares used in basic computation	137,599	134,075
Dilutive effect of common stock equivalents	825	3,236
Weighted average shares used in dilutive computation	138,424	137,311
Basic earnings per share	$ 0.09	$ 0.09
Diluted earnings per share	$ 0.09	$ 0.09

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