Reconciliation of Share Amount Used in Computation of Basic and Diluted Earnings Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Basic earnings (loss) per share-Weighted common shares outstanding	140,353	139,311	138,950
Weighted common shares assumed upon exercise of options and vesting of restricted stock units	768	751	668
Diluted earnings (loss) per share-Weighted common shares outstanding	141,121	140,062	139,618