v3.2.0.727
Earnings Per Share - Additional Information (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Weighted average employee stock options excluded from the determination of diluted net income per common and common equivalent share (in shares) 49 49 94 34