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Debt - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 29, 2016
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Apr. 30, 2013
USD ($)
Apr. 30, 2012
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
May 31, 2012
USD ($)
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount           $ 286,550,000   $ 286,550,000   $ 323,548,000  
Interest expense           3,906,000 $ 4,784,000 11,938,000 $ 14,759,000    
Line of credit facility, decrease, repayments               455,000 613,000    
Gains (losses) on extinguishment of debt, total               (487,000) (5,620,000)    
Shareholders' Equity                      
Debt Instrument [Line Items]                      
Debt instrument, repurchase amount $ 35,200,000                 54,200,000  
Debt instrument, repurchased face amount                   19,000,000  
Business combination, recognized identifiable assets acquired and liabilities assumed, current liabilities, long-term debt 42,100,000                 22,900,000  
Gains (losses) on extinguishment of debt, total $ 500,000                    
Convertible Senior Notes                      
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount         $ 150,000,000 150,000,000   $ 150,000,000      
Notes issued, interest rate         3.375%            
Notes issued, interest payment frequency               semi-annually      
Convertible Senior Notes | Walker Group Holdings LLC                      
Debt Instrument [Line Items]                      
Proceeds from issuance of convertible senior notes               $ 145,100,000      
Debt Instrument Maturity Year         2018            
Unsecured Debt | Convertible Senior Notes                      
Debt Instrument [Line Items]                      
Notes initial conversion rate per 1,000 in principal amount               85.4372      
Principal amount of notes conversation for 85.4372 shares of common stock           $ 1,000   $ 1,000      
Notes initial conversion price | $ / shares           $ 11.70   $ 11.70      
Convertible notes, conversation date               Nov. 01, 2017      
Proceeds from notes issued               $ 1,000      
Estimated implied interest rate           7.00%   7.00%      
Fair value of liability component upon issuance           $ 123,800,000   $ 123,800,000      
Difference between cash proceeds before offering expenses and the estimated fair value of liability component           21,700,000   21,700,000      
Proceeds from issuance of convertible senior notes               145,500,000      
Debt Conversion, Converted Instrument, Amount               $ 21,000,000      
Unsecured Debt | Convertible Senior Notes | Scenario 1                      
Debt Instrument [Line Items]                      
Number of trading days               30 days      
Number of consecutive trading days               30 days      
Last reported sale price of common stock as percentage of conversion price               130.00%      
Unsecured Debt | Convertible Senior Notes | Scenario 2                      
Debt Instrument [Line Items]                      
Convertible senior notes, trading price per $1,000 principal amount of notes as percentage of the product of the last reported sale price of common stock and the conversion rate               98.00%      
Amended Credit Agreement                      
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount             $ 1,000,000   1,000,000    
Interest Paid               $ 6,200,000 $ 7,100,000    
Long-term debt           1,400,000   1,400,000      
Interest expense               100,000   200,000  
Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount   $ 150,000,000                  
Credit facility, borrowing capacity   $ 175,000,000                  
Credit facility, interest rate above basis   12.50%                  
Line of Credit Facility, Remaining Borrowing Capacity           359,000,000   $ 359,000,000      
Debt Instrument, Term   5 years                  
Line Of Credit Facility Amendment Description               Liquidity of at least $125 million and (y) availability under the Credit Facility of at least $25 million. Liquidity, as defined in the Credit Agreement, reflects the difference between (i) the sum of (A) unrestricted cash and cash equivalents and (B) availability under the Credit Facility and (ii) the amount necessary to fully redeem the Notes.      
Debt Instrument, Maturity Date, Description               extends the maturity date of the Credit Facility from May 2017 to June 2020      
Revolving Credit Facility | LIBOR                      
Debt Instrument [Line Items]                      
Debt Instrument, Description of Variable Rate Basis               basis points to 200 basis points (in lieu of the previous range from 175 basis points to 225 basis points), or (y) a base rate plus a margin ranging from 50 basis points to 100 basis points (in lieu of the previous range from 75 basis points to 125 basis points), in each case, based upon the monthly average excess availability under the Credit Facility, (ii) provides that the monthly unused line fee shall be equal to 25 basis points (which amount was previously 37.5 basis points) times the average unused availability under the Credit Facility, (iii) provides that if availability under the Credit Facility is less than 12.5% (which threshold was previously 15%) of the total commitment under the Credit Facility or if there exists an event of default, amounts in any of the Borrowers and the subsidiary guarantors deposit accounts (other than certain excluded accounts) will be transferred daily into a blocked account held by the Agent and applied to reduce the outstanding amounts under the Credit Facility      
Revolving Credit Facility | Senior Secured Credit Facility                      
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount   $ 175,000,000       75,000,000   $ 75,000,000      
Term Loan Credit Facilty                      
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount           189,952,000   $ 189,952,000   $ 191,399,000  
Credit facility, maturity date     Mar. 31, 2022                
Line of credit facility potential term extension period     91 days                
Term Loan Credit Facilty | LIBOR                      
Debt Instrument [Line Items]                      
Debt Instrument Maturity Term Description               LIBOR (subject to a floor of 1.00%) plus a margin of 3.25% or (ii) a base rate plus a margin of 2.25%.      
Term Loan Credit Facilty | Incremental Senior Credit Facility                      
Debt Instrument [Line Items]                      
Senior Secured Leverage Ratio               3.0 to 1.0      
Term Loan Credit Facilty | Amended Credit Agreement                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Remaining Borrowing Capacity       $ 297,000,000              
Long-term debt       277,000,000              
Line of credit facility, decrease, repayments       $ 20,000,000              
Term Loan Credit Facilty | Tranche B-1 Loans [Member]                      
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount     $ 192,800,000                
Term Loan Credit Facilty | Tranche B-2 Loans [Member]                      
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount     $ 192,800,000                
Term Loan Credit Agreement                      
Debt Instrument [Line Items]                      
Percentage of tranche loan amount on equal quarterly installments     0.25%                
Line of Credit Facility, Amount Outstanding           $ 190,000,000   $ 190,000,000      
Debt Instrument, Periodic Payment, Principal               $ 1,900,000      
Term Loan Credit Agreement | Senior Secured Credit Facility                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Amount Outstanding                     $ 300,000,000
Minimum                      
Debt Instrument [Line Items]                      
Debt Conversion, Converted Instrument, Amount     $ 125,000,000                
Minimum | Unsecured Debt | Convertible Senior Notes | Scenario 1                      
Debt Instrument [Line Items]                      
Number of trading days               20 days      
Minimum | Revolving Credit Facility | Amended and Restated Credit Agreement                      
Debt Instrument [Line Items]                      
Fixed Charge Coverage Ratio Minimum   1.0                  
Maximum | Revolving Credit Facility | Amended and Restated Credit Agreement                      
Debt Instrument [Line Items]                      
Fixed Charge Coverage Ratio Minimum   1.1