XML 65 R51.htm IDEA: XBRL DOCUMENT v3.8.0.1
Derivatives - Additional Information (Detail) - USD ($)
 3 Months Ended
Sep. 30, 2016
Mar. 31, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Maximum period for hedging a portion of forecasted foreign currency denominated intercompany sales of inventory   18 months  
Gross notional values of outstanding forward foreign exchange contracts   $ 228,463,000 $ 208,922,000
Accumulated other comprehensive income realization period   12 months  
Interest Rate Hedge [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Percentage of debt which is subject to interest rate swap fixed rate 50.00%    
Interest rate swap agreement, credit spread rate   2.00%  
Interest rate swap agreement, maturity date Sep. 30, 2020    
Interest rate swap agreement, notional amount   $ 305,000,000 305,000,000
Interest rate swap agreement, interest rate description   The Company entered into an interest rate swap agreement to fix the rate on approximately 50% of its then-outstanding balance under the Credit Agreement, as described further in Note 10. This hedge fixes the interest rate paid on the hedged debt at 1.198% per annum plus the applicable credit spread, which was 2.00% as of March 31, 2018, through September 30, 2020.  
Interest rate swap agreement, fair value   $ 8,170,000 $ 6,179,000
Cash Flow Hedging [Member] | Interest Rate Hedge [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Interest rate swap agreement, interest rate 1.198%