v3.3.1.900
Stock-Based Compensation - Restricted Stock and RSU Activity (Parenthetical) (Detail)
shares in Millions
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based compensation awards expected to vest 2.8
Awards vested, not converted 0.2
Market Performance-based RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based compensation awards expected to vest 1.3