Debt, Capital Lease Obligation and Inventory Financing Facility - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Outstanding borrowing	$ 2,000,000	$ 2,000,000	$ 115,000,000
Line of credit facility interest rate description condition 1		Prime rate plus a predetermined spread of 0.00% to 0.75%
LIBOR, Interest Rate Description		LIBOR rate plus a pre-determined spread of 1.25% to 2.25%
Debt Instrument, Description of Variable Rate Basis		LIBOR
Amount of Facility Permitted by Qualified Receivables	200,000,000	200,000,000
Maximum leverage ratio times adjusted earnings	2.75	2.75
Maximum combined borrowing capacity under senior revolving credit facility and ABS facility	550,000,000	550,000,000
Covenant Compliance	At September 30, 2012, we were in compliance with all such covenants.
Inventory Financing Facility Borrowing Capacity	200,000,000	200,000,000	150,000,000
Inventory financing facility maturity date	Apr. 26, 2017	Apr. 26, 2017
Inventory financing facility	103,223,000	103,223,000	93,933,000
Senior Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	350,000,000	350,000,000	300,000,000
Line of credit facility amount available for borrowings in foreign currencies and US dollar	25,000,000	25,000,000
Amount available for issuance of letter of credit	25,000,000	25,000,000
Prime rate	3.25%	3.25%
Maturity date		Apr. 26, 2017
Outstanding borrowing	2,000,000	2,000,000
Senior Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate condition 1	0.00%	0.00%
LIBOR rate plus pre-determined spread	1.25%	1.25%
Commitment fee on the unused portion of the facility		0.25%
Senior Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate condition 1	0.75%	0.75%
LIBOR rate plus pre-determined spread	2.25%	2.25%
Commitment fee on the unused portion of the facility		0.45%
ABS Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	200,000,000	200,000,000	150,000,000
Prime rate	1.12%	1.12%
Maturity date		Apr. 24, 2015
Applicable interest rate		0.90%
Commitment fee on the unused portion of the facility, utilization is more than specified percentage		0.30%
Minimum percentage of utilization of line of credit facility under condition one		50.00%
Commitment fee on the unused portion of the facility, utilization is less than specified percentage		0.40%
Maximum percentage of utilization of line of credit facility under condition two		50.00%
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Value of equipment subject to capital leases and included in property plant and equipment	3,867,000	3,867,000
Accumulated Depreciation on the Capital lease	$ 3,039,000	$ 3,039,000	$ 2,287,000
Letter of Credit [Member] | Minimum [Member]
Debt Instrument [Line Items]
Participation fee on letter of credit	1.25%	1.25%
Letter of Credit [Member] | Maximum [Member]
Debt Instrument [Line Items]
Participation fee on letter of credit	2.25%	2.25%