Activity for Stock Option (Detail) (Stock Options, USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of period	2,728,000
Granted	1,230,000
Exercised	(68,000)
Cancelled/expired/forfeited	(128,000)
Outstanding at end of period	3,762,000
Exercisable at end of period	2,040,000
Outstanding at beginning of period	$ 12.24
Granted	$ 10.39
Exercised	$ 2.51
Cancelled/expired/forfeited	$ 13.37
Outstanding at end of period	$ 11.78
Exercisable at end of period	$ 11.28
Outstanding at end of period	4 years 2 months 12 days
Exercisable at end of period	2 years 10 months 24 days
Aggregate Intrinsic Value, outstanding	$ 3.5
Aggregate Intrinsic Value, exercisable	$ 3.4