Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.19.2
Share-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 9,900,000 $ 10,400,000 $ 20,500,000 $ 20,200,000
Unrecognized compensation cost on non-vested stock awards 71,500,000   $ 71,500,000  
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition     1 year 7 months 6 days  
Total vesting date fair value of stock units $ 1,900,000 $ 2,100,000 $ 10,900,000 $ 2,100,000
SARs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
SARs granted 0 0 0 0
Total intrinsic value of awards exercised for SARs $ 5,300,000 $ 64,800,000 $ 17,200,000 $ 187,000,000.0