Schedule of Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt current and noncurrent	$ 103,440	$ 106,742
Less: current portion of long-term debt	3,000	1,500
Long-term debt	100,440	105,242
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt current and noncurrent	61,350	64,350
Term Loan
Debt Instrument [Line Items]
Long-term debt current and noncurrent	20,000	20,000
Convertible Promissory Notes
Debt Instrument [Line Items]
Long-term debt current and noncurrent	20,000	20,000
Swing Loan Credit Facility
Debt Instrument [Line Items]
Long-term debt current and noncurrent	$ 2,090	$ 2,392