Long-Term Incentive Plans (Stock Options Outstanding) (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Long-Term Incentive Plans [Abstract]
Number of shares, outstanding at beginning of year	2,548,000	3,715,406	5,963,268
Stock option awards exercised	0	(400,000)	0
Options expired or canceled	(222,700)	(767,406)	(2,247,862)
Number of shares, outstanding at end of year	2,325,300	2,548,000	3,715,406
Number of shares, exercisable at end of year	2,325,300	1,798,000	1,752,311
Outstanding at beginning of year, weighted average price per share	$ 10.9888	$ 20.6883	$ 19.0485
Exercised, weighted average price per share	0	4.02	0
Expired or canceled, weighted average price per share	59.2118	61.5815	16.3382
Outstanding at end of year, weighted average price per share	6.3703	10.9888	20.6883
Exercisable at end of year, weighted average price per share	$ 6.3703	$ 13.466	$ 38.512