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Description of Business and Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Depreciation and Amortization      
Depreciation expense $ 8.1 $ 8.5 $ 14.3
Deferred Costs      
Impairment of ongoing project, deferred costs   0.7  
Advertising Expense      
Advertising expense $ 16.5 $ 23.1 $ 30.6
Equipment and Software | Minimum      
Depreciation and Amortization      
Useful life (in years) 3 years    
Equipment and Software | Maximum      
Depreciation and Amortization      
Useful life (in years) 5 years