Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Assets and Liabilities Recorded at Fair Value (Parenthetical) (Detail)

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Fair Value Measurements - Assets and Liabilities Recorded at Fair Value (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Cash flow swaps and interest rate caps designated as hedges $ 3.8 $ 2.8
Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Cash flow swaps and interest rate caps designated as hedges 0.5  
Other Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Cash flow swaps and interest rate caps designated as hedges 1.8 3.7
Other Long-Term Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Cash flow swaps and interest rate caps designated as hedges $ 1.1 $ 2.4