XML 93 R75.htm IDEA: XBRL DOCUMENT v3.8.0.1
Earnings Per Share - Narrative (Detail) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]      
Anti-dilutive shares 9,509,090 11,218,633 8,931,669