Long Term Debt (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt including current portion	$ 46,900,000	$ 102,700,000
Current portion of long-term obligations	(13,904,000)	(35,807,000)
Total	33,000,000	66,900,000
Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt including current portion	45,000,000	57,000,000
Series A Notes [Member]
Debt Instrument [Line Items]
Long-term debt including current portion	0	20,000,000
Series B Notes [Member]
Debt Instrument [Line Items]
Long-term debt including current portion	0	20,000,000
Promissory Notes [Member]
Debt Instrument [Line Items]
Long-term debt including current portion	$ 1,900,000	$ 5,700,000