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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Variable Interest Entity [Line Items]          
Investment in the common stock     49.00%    
PHIC's date of incorporation     May 26, 2011    
Earnings in equity of unconsolidated affiliate $ 1.0   $ 2.4    
Trade receivables 4.1   4.1   $ 4.8
Other assets $ 2.9   $ 2.9   0.5
Accounts Receivable - Other [Member]          
Variable Interest Entity [Line Items]          
Loan to affiliate         $ 0.4
Maximum [Member]          
Variable Interest Entity [Line Items]          
Earnings in equity of unconsolidated affiliate   $ 0.1   $ 0.1