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Debt - $500 Million Term Loan B - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2017
May 10, 2017
Debt Instrument [Line Items]    
Net proceeds from credit facility $ 200,000,000  
$400 Million Term Loan Facility [Member]    
Debt Instrument [Line Items]    
Total credit facility   $ 400,000,000
$500 Million Term Loan B [Member]    
Debt Instrument [Line Items]    
Total credit facility $ 500,000,000  
Maturity date for credit facility May 11, 2024  
Debt Instrument, description of interest rate (i) LIBOR plus 2.25% or (ii) a base rate as set in the Amended Credit Agreement.  
Spread rate added to LIBOR 2.25%  
Net proceeds from credit facility $ 114,300,000  
Periodic payment, percentage on principal amount 1.00%