Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Current portion of long-term debt	$ 7,500	$ 10,000
Long-term debt	42,500	58,000
Senior Credit Facilities
Debt Instrument [Line Items]
Total Senior Credit Facility	50,000	68,000
Senior Credit Facilities | Term Loan
Debt Instrument [Line Items]
Current portion of long-term debt	7,500	10,000
Long-term debt	42,500	30,000
Senior Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt		$ 28,000