Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Parenthetical) (Detail)

v2.4.0.8
Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Parenthetical) (Detail)
6 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Market and performance condition awards [Member]
Dec. 31, 2013
Market and performance condition awards [Member]
Jun. 30, 2014
Market condition awards [Member]
Dec. 31, 2013
Market condition awards [Member]
Jun. 30, 2014
Performance condition awards [Member]
Dec. 31, 2013
Performance condition awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Outstanding SARs   900,000 900,000 1,500,000 1,500,000 1,000,000 400,000
Exercisable SARs       1,500,000      
Outstanding awards granted 1,509,000         600,000