XML 43 R31.htm IDEA: XBRL DOCUMENT v3.19.2
Stock Split and Stock Repurchase - Additional Information (Detail) - shares
6 Months Ended
Apr. 23, 2019
Jun. 30, 2019
Jul. 25, 2017
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase program expiration date   Sep. 30, 2020  
Minimum number of shares that company is required to repurchase   0  
Stock repurchased under authorization   0  
Dividends Common Stock Percentage of Stock Dividend 100.00%    
Stockholders' Equity Note, Stock Split two-for-one stock split    
Dividends Payable, Date of Record May 15, 2019    
Dividends Payable, Date to be Paid Jun. 03, 2019    
Maximum [Member]      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase program, number of shares authorized to be repurchased     2,000,000