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Investment in Variable Interest Entity and Other Investments and Affiliates - Additional Information (Detail) - PHI Century Limited [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Variable Interest Entity [Line Items]          
Investment in the common stock     49.00% 49.00%  
PHIC's date of incorporation     May 26, 2011    
Earnings (loss) in equity of unconsolidated affiliate $ (0.1) $ (0.1) $ 0.2 $ 1.0  
Trade receivables 4.4   4.4   $ 4.0
Other assets 0.5   0.5   $ 0.3
Accounts Receivable - Other [Member]          
Variable Interest Entity [Line Items]          
Loan to affiliate $ 0.4   $ 0.4