Investment in Variable Interest Entity - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Variable Interest Entity [Line Items]
Earnings (loss) in equity of unconsolidated affiliate	$ (100,000)	$ (100,000)
Trade receivables	2,800,000		2,800,000
Accrued and other current liabilities	30,085,000		52,812,000
Other assets	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%
Accrued and other current liabilities	$ 1,000,000		$ 900,000