Summary of Significant Accounting Policies - Computation of Basic and Diluted EPS (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted Average Number Of Shares Outstanding Diluted Disclosure Items [Abstract]
Weighted average common shares outstanding - used in calculation of basic EPS	91,098	83,314	81,195
Weighted average common stock equivalents	4,350	4,017	4,421
Weighted average common and common equivalent shares outstanding - used in calculation of diluted EPS	95,448	87,331	85,616