XML 75 R65.htm IDEA: XBRL DOCUMENT v3.10.0.1
Debt - Additional Information (Detail) - Multi currency revolving credit agreement [Member] - USD ($)
Jan. 30, 2018
Sep. 30, 2018
Jan. 29, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Revolving credit agreement term 5 years      
Revolving credit agreement $ 350,000,000   $ 125,000,000  
Credit agreement secured date Jan. 30, 2023      
Letters of Credit Outstanding   $ 5,041,000    
Debt Outstanding   0    
Unused Revolving credit   344,959,000    
Unrestricted retained earnings   $ 169,388,000   $ 190,495,000