Long-Term Debt and Capital Lease Obligations - Additional Information (Detail) (USD $)	6 Months Ended				6 Months Ended		1 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Revolving credit facility	Sep. 30, 2008 Revolving credit facility	Jun. 30, 2011 Term loan facility Year	Sep. 30, 2008 Term loan facility	Apr. 30, 2011 Equipment
Debt Instrument [Line Items]
Credit Agreement, date	Sep. 30, 2008
Revolving credit facility, amount				$ 15,000,000
Revolving credit facility, extension capacity				15,000,000
Revolving credit facility, sublimit for the issuance of standby letters of credit				10,000,000
Credit Agreement, maturity			Sep. 30, 2011		Sep. 30, 2013
Term loan facility, borrowed amount						6,000,000
Term loan facility, term					5
Term loan facility, frequency of payments					quarterly
Term loan facility, quarterly payment start date					2008-12-31
Term loan facility, quarterly payment amount					75,000
The Company is allowed to lease from the financing company eligible equipment purchases, submitted within the applicable equipment's invoice date of	90 days
Capital lease obligations terms	The capital lease has a 36 month term which is payable in equal monthly installments, commencing on the first day of the fourth month after the date of the disbursements of such loan and continuing on the first day of each month thereafter until paid in full.
Capital lease term	36 months
Outstanding capital leases	0	3,891,000
Weighted average interest rate implicit in the capital lease	4.30%	4.30%
Assets purchased							$ 1,103