Investment in Variable Interest Entity - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Variable Interest Entity [Line Items]
Earnings (loss) in equity of unconsolidated affiliate	$ 100,000	$ 100,000	$ 100,000	$ 200,000
Trade receivables	1,500,000		1,500,000
Other assets	$ 0		$ 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					$ 1,500,000