Stockholders' Equity (Deficit) (Detail) - Summary of Transactions Relating to Common Stock - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Common Stock
Common Stock Outstanding Roll Forward [Roll Forward]
Beginning Balance	156,234,415	156,234,415	156,234,415
Issuances under stock plans	0	0
Purchases for treasury	0	0
Ending Balance	156,234,415	156,234,415	156,234,415
Treasury Stock
Common Stock Outstanding Roll Forward [Roll Forward]
Beginning Balance	73,896,245	68,713,890	64,268,863
Issuances under stock plans	923,696	1,003,746	1,452,419
Purchases for treasury	610,623	6,186,101	5,897,446
Ending Balance	73,583,172	73,896,245	68,713,890