Quarterly report pursuant to Section 13 or 15(d)

Share Repurchase Program - Summary of Stock Repurchase Activities (Detail)

v3.8.0.1
Share Repurchase Program - Summary of Stock Repurchase Activities (Detail)
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Share Repurchase Program [Abstract]  
Shares repurchased | shares 75,991
Average cost per share | $ / shares $ 39.47
Total cost of shares repurchased | $ $ 3,000,000