Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2013 Federal	Dec. 31, 2013 California	Sep. 30, 2014 Minimum	Dec. 31, 2013 Minimum California	Dec. 31, 2013 Maximum California
Income Taxes [Line Items]
Income tax refund requested	$ 24.8				$ 2.0
Overpayment of tax return refund	0.5
Adjustment in estimated tax payment	0.6
Income Tax Examination, Interest Accrued	0.3
Net operating loss carry forwards			932.8	994.0
Net operating loss expiration period			20 years			10 years	20 years
Net operating loss carry forwards expiration year			2027	2017
Deferred tax asset valuation allowance	390.2	375.0
Income Tax Examination, Increase (Decrease) in Liability from Prior Year	$ 42.4