Variable Interest Entity ("VIE") - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Apr. 12, 2013	Dec. 31, 2013	Oct. 02, 2013	Apr. 26, 2013	Mar. 22, 2013	Mar. 18, 2013
Variable Interest Entity [Line Items]
Equity investment at risk		$ 9,000,000	$ 3,500,000	$ 1,900,000		$ 3,100,000
Capital contribution made by non controlling interest		500,000
Maximum capital contributions amount by company		8,500,000
Maximum capital contributions amount by minority interest		500,000
Capital contribution made by company		8,500,000	3,500,000	1,850,000	3,150,000
Carrying value of investment		6,000,000
Investment		8,700,000
Cash collateral letter of credit issued	200,000	236,000
Letter of credit expiration date	Apr. 15, 2014
Goodwill	$ 3,800,000