Variable Interest Entity - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Earnings (loss) in equity of unconsolidated affiliate	$ 100,000	$ (300,000)
Trade receivables	2,800,000	3,500,000
Accrued and other current liabilities	52,812,000	54,531,000
Other assets	0	0
Operating revenue	3,400,000	2,000,000
PHIC's date of incorporation	May 26, 2011
PHI Century Limited [Member]
Variable Interest Entity [Line Items]
Investment in the common stock	49.00%
Accrued and other current liabilities	$ 900,000	$ 1,900,000