Financing Arrangements - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Aug. 29, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity		$ 230,000,000
Amount outstanding under letters of credit		1,297,000	3,265,000
Asset-based credit facility		25,660,000	0
Cash and cash equivalents		36,793,000	52,003,000	43,023,000	55,043,000
Asset-based credit facility, maturity date			Jun. 30, 2016
Period fixed charge cover ratio must be in compliance if borrowing base falls below threshold		30 days
Debt Instrument Fixed Charge Coverage		25,000,000
Average outstanding borrowing		37,175,000
Average available liquidity		88,550,000
Description of condition to reduce applicable margin to interest rate		All applicable margins may be permanently reduced by 0.25% if EBITDA meets or exceeds $25,000,000 over any trailing 12 month period, and may be permanently reduced by an additional 0.25% if EBITDA meets or exceeds $50,000,000 over any trailing 12 month period.
Asset-based credit facility, interest rate			4.50%
Asset-based credit facility, origination fees			4,302,000
Unamortized origination fees		2,295,000	3,171,000
Asset-based credit facility, origination fees included in other current assets		918,000	906,000
Asset-based credit facility, origination fees included in other long-term assets		1,377,000	2,265,000
Convertible senior notes	112,500,000
Convertible senior notes interest rate	3.75%
Convertible senior notes due date	Aug. 15, 2019
Preferred stock, cumulative dividend rate (in percent)	7.50%
Preferred stock, par value	$ 0.01	$ 0.01	$ 0.01
Convertible senior notes, percentage of principal amount	95.02%
Convertible senior notes, effective rate of interest	4.59%
Convertible senior notes, transactional fees	3,534,000
Convertible senior notes, net carrying amount		107,835,000	107,133,000
Convertible senior notes, unamortized discount		4,665,000	5,367,000
Convertible senior notes, remaining amortization period		5 years 7 months 13 days
Convertible senior notes, total interest and amortization expense recognized		4,907,000
Convertible senior notes convertible latest date		Aug. 15, 2019
Initial conversion rate, number of common stock issuable		0.1333333
Conversion price per share		$ 7.50
Repurchase price as percentage of principal amount of senior notes		100.00%
Notes redemption earliest date			Aug. 15, 2015
Redemption price as percentage of principal amount of notes		100.00%
United States
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity		158,333,000
Asset-based credit facility, available for letter of credit		20,000,000
Canada
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity		31,667,000
Asset-based credit facility, available for letter of credit		5,000,000
United Kingdom
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity		40,000,000
Asset-based credit facility, available for letter of credit		2,000,000
Preferred Stock
Debt Instrument [Line Items]
Preferred stock to debt exchange (in shares)	632,270
Exchanged for Preferred Stock
Debt Instrument [Line Items]
Convertible senior notes	63,227,000
Private placement purchase agreements
Debt Instrument [Line Items]
Convertible senior notes	49,273,000
Scenario 1
Debt Instrument [Line Items]
Applicable margin rate reduction, (in percent)		0.25%
Scenario 2
Debt Instrument [Line Items]
Applicable margin rate reduction, (in percent)		0.25%
Scenario, Plan
Debt Instrument [Line Items]
Maximum amount of consolidated funded indebtedness including borrowing outstanding		23,191,000
Available liquidity		59,984,000
Unamortized Advisory Fee
Debt Instrument [Line Items]
Unamortized, transaction Fees		2,863,000	3,365,000
Unamortized Advisory Fee | Other current assets
Debt Instrument [Line Items]
Unamortized, transaction Fees		505,000	505,000,000
Unamortized Advisory Fee | Other Long Term Assets
Debt Instrument [Line Items]
Unamortized, transaction Fees		2,358,000	2,860,000
Minimum
Debt Instrument [Line Items]
Asset-based credit facility, monthly fees		0.375%
Minimum | Scenario 1
Debt Instrument [Line Items]
Amount of EBITDA to reduce applicable margin		25,000,000
Minimum | Scenario 2
Debt Instrument [Line Items]
Amount of EBITDA to reduce applicable margin		$ 50,000,000
Maximum
Debt Instrument [Line Items]
Asset-based credit facility, monthly fees		0.50%