Investment in Variable Interest Entity and Other Investments and Affiliates - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| PHI Century Limited [Member] | |||||
| Variable Interest Entity [Line Items] | |||||
| Investment in the common stock | 49.00% | 49.00% | 49.00% | ||
| PHIC's date of incorporation | May 26, 2011 | ||||
| Earnings (loss) in equity of unconsolidated affiliate | $ 0.1 | $ (0.2) | $ 1.0 | $ 0.3 | |
| Trade receivables | 3.6 | $ 2.0 | 3.6 | ||
| Other assets | 0.4 | $ 0.2 | 0.4 | ||
| PHI-HNZ Australia Ltd [Member] | |||||
| Variable Interest Entity [Line Items] | |||||
| Investment in the common stock | 50.00% | ||||
| Earnings (loss) in equity of unconsolidated affiliate | 0.5 | (0.5) | |||
| Trade receivables | 5.9 | 5.9 | |||
| Other assets | $ (0.5) | $ (0.5) | |||
| HNZ Group, Inc. [Member] | PHI-HNZ Australia Ltd [Member] | |||||
| Variable Interest Entity [Line Items] | |||||
| Investment in the common stock | 50.00% | ||||