Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v2.4.0.8
Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits $ 0 $ 0  
Liabilities for unrecognized tax benefits     0.9
Unrecognized tax benefit, interest accrued net of federal income tax benefits     0.02
Unrecognized tax benefits, penalty     0.02
Reduction of reserve     0.4
Valuation allowance to offset deferred tax asset $ 2.9