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New Accounting Pronouncements - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
Business_Units
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Number of business units inconsistent with revenue recognition | Business_Units 2    
Accounting Standards Update 2016-18 [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
New accounting pronouncements or adoption of new standard resulted of cash used in (decrease) increase in operating activities $ (3.2) $ 1.2  
Accounting Standards Update 2016-02 [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Future minimum cash commitments under operating leases     $ 200.0