XML 73 R62.htm IDEA: XBRL DOCUMENT v3.19.1
Earnings Per Share - Additional Information (Detail) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Stock repurchase program authorized amount   $ 100,000
Shares repurchased 1.2  
Shares repurchased at cost $ 14,069  
Performance Restricted Stock Units [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Mark-to-market adjustment $ 900