Annual report pursuant to Section 13 and 15(d)

Subsequent Event - Dividend Declaration - Additional Information (Detail)

v3.8.0.1
Subsequent Event - Dividend Declaration - Additional Information (Detail) - $ / shares
12 Months Ended
Feb. 22, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Subsequent Event [Line Items]        
Cash Dividends approved per common share [1]   $ 1.16 $ 1.08 $ 1.00
Subsequent Event        
Subsequent Event [Line Items]        
Cash Dividends approved per common share $ 0.32      
Record Date Mar. 08, 2018      
Payable Date Mar. 22, 2018      
[1] Beginning with the dividend declared on February 24, 2016, the Company’s board of directors raised the quarterly dividend to $0.27 per common share. Beginning with the dividend declared on February 23, 2017, the Company’s board of directors raised the quarterly dividend to $0.29 per common share.