Investment in Variable Interest Entity - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Variable Interest Entity [Line Items]
PHIC's date of incorporation		May 26, 2011
Loss in equity of unconsolidated affiliate	$ (172,000)	$ 911,000
Trade receivables	5,600,000	5,600,000
Note receivable outstanding	1,000,000	1,000,000
Other assets	(1,700,000)	(1,700,000)
Operating revenue		$ 2,000,000
PHI Century Limited [Member]
Variable Interest Entity [Line Items]
Investment in the common stock		49.00%