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Debt - Additional Information (Detail) - USD ($)
Jan. 03, 2019
Mar. 31, 2019
Debt Instrument [Line Items]    
Credit facility, maximum borrowing capacity amount $ 200,000,000  
Aggregate principal amount   $ 153,438,000
Percentage of voting equity of subsidiaries 65.00%  
Maximum [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Interest rate 2.50%  
Maximum [Member] | Base Rate [Member]    
Debt Instrument [Line Items]    
Interest rate 1.50%  
Minimum [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Interest rate 1.75%  
Minimum [Member] | Base Rate [Member]    
Debt Instrument [Line Items]    
Interest rate 0.75%  
Term Loans [Member]    
Debt Instrument [Line Items]    
Aggregate principal amount $ 125,000,000 123,438,000
Senior secured term loans $ 125,000,000  
Debt instrument maturity date Jan. 03, 2024  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Aggregate principal amount   $ 30,000,000
Line of credit facility, maximum borrowing capacity $ 75,000,000  
Line of credit facility current borrowing capacity $ 50,000,000  
Credit facility maturity date Jan. 03, 2024  
Percentage of commitment fee on the unused portion of the facility 0.35%  
Line of credit facility unused capacity commitment fee percentage 0.30%  
Revolving Credit Facility [Member] | Letters of Credit [Member]    
Debt Instrument [Line Items]    
Available for issuance of letter of credit $ 5,000,000  
Debt cost incurred related to revolving credit facility $ 1,800,000  
Debt instrument, amortized over the term 5 years  
Revolving Credit Facility [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Increase (decrease) in line of credit facility $ 50,000,000  
Revolving Credit Facility [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Line of credit facility unused capacity commitment fee percentage 0.25%