Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		3 Months Ended			3 Months Ended		3 Months Ended						1 Months Ended	3 Months Ended		1 Months Ended		1 Months Ended			3 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2012 Maximum	Dec. 31, 2012 Year One	Dec. 31, 2012 Year One Minimum	Dec. 31, 2012 Year Two	Dec. 31, 2012 Year Two Average	Dec. 31, 2012 There After	Dec. 31, 2012 There After Maximum	Dec. 31, 2012 Base Rate Loans Minimum	Dec. 31, 2012 Base Rate Loans Maximum	Dec. 31, 2012 Eurodollar Loans Minimum	Dec. 31, 2012 Eurodollar Loans Maximum	Oct. 26, 2012 Credit Facility	Dec. 31, 2012 Credit Facility	Dec. 31, 2012 Term Loan	Feb. 28, 2007 Senior Notes	Oct. 26, 2012 Senior Notes Credit Facility	Oct. 26, 2012 Senior Notes Credit Agreement	Jan. 31, 2011 ABL Credit Facility	Oct. 26, 2012 Revolving Loans Credit Facility	Dec. 31, 2012 Letter of Credit
Debt Instrument [Line Items]
Aggregate principal amount																	$ 110,000
Annual interest rate	9.00%	9.00%								0.75%	1.50%	1.75%	2.50%				9.00%
Line of credit facility, expiration date																	Feb. 01, 2015			Feb. 01, 2015		Apr. 01, 2016
Aggregate principal amount outstanding																			65,000
Redemption price percentage of principal amount																			102.25%
Net loss on debt retirement	(2,835)																		2,835
Call premium amount included in the debt retirement net loss																			1,463
Unamortized debt issuance cost included in the debt retirement net loss																			1,251
Other expenses included in the debt retirement net loss																			121
Drawn amount under the credit facility																		85,000		20,000	25,000
Maturity period for the credit facility														5 years						90 days
Principal amount under the credit facility														60,000
Outstanding amount in connection with the issuance of letter of credit																					5,000
Amortization of term loan, 2013																4,500
Amortization of term loan, 2014																6,000
Amortization of term loan, 2015																6,000
Amortization of term loan, 2016																6,000
Amortization of term loan, 2017																7,500
Amortization of term loan, thereafter																30,000
Leverage Ratio	1.34		3.00
Debt Service Coverage Ratio	5.63%				2.00%		2.25%		2.50%
Debt Service Coverage Ratio Commencing Date				Sep. 30, 2014		Sep. 29, 2015		Sep. 30, 2015
Debt issuance cost															1,364
Letter of credit outstanding	$ 385
Percentage of Letter of credit outstanding																						105.00%