XML 49 R39.htm IDEA: XBRL DOCUMENT v3.10.0.1
Earnings Per Share - Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Anti-dilutive securities (in shares) 371 8 353 17