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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
ASU 2018-02 [Member] | Gains (Losses) on Cash Flow Hedges [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Tax Cuts and Jobs Act of 2017, reclassification from accumulated other comprehensive income to accumulated deficit $ 1.1      
ASU 2016-18 [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Increased (decreased) in net cash used in investing activities   $ 0.4 $ (0.2)  
ASU 2016-02 [Member] | Subsequent Event [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Lease right-of-use assets       $ 130.0
Lease liabilities       $ 130.0