Investment in Variable Interest Entity - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 30, 2015
Variable Interest Entity [Line Items]
Earnings (loss) in equity of unconsolidated affiliate	$ (0.2)	$ (0.1)	$ (0.3)	$ (0.2)
Trade receivables	0.0		0.0
Other assets	$ 0.9		$ 0.9		$ 0.0
PHIC's date of incorporation			May 26, 2011
PHI Century Limited [Member]
Variable Interest Entity [Line Items]
Investment in the common stock			49.00%
Allowance for Trade Receivables [Member]
Variable Interest Entity [Line Items]
Allowance for bad debts against trade receivables					$ 1.5