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Debt - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 04, 2015
USD ($)
Mar. 19, 2015
USD ($)
Apr. 30, 2013
USD ($)
Nov. 30, 2012
USD ($)
Apr. 30, 2012
USD ($)
Sep. 30, 2015
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
May. 31, 2012
USD ($)
Debt Instrument [Line Items]                        
Notes issued, aggregate principal amount           $ 343,208,000     $ 343,208,000   $ 344,490,000  
Notes initial conversion price | $ / shares           $ 11.70     $ 11.70      
Current portion of long-term debt           $ 2,440,000     $ 2,440,000   496,000  
Debt issuance costs paid                 2,581,000 $ 0    
Interest expense           4,784,000 $ 5,454,000   14,759,000 16,904,000    
Line of credit facility, decrease, repayments                 613,000 565,000    
Proceeds from Sale of Property, Plant, and Equipment                 13,180,000 86,000    
Prepaid Expense and Other Assets, Current           18,265,000     18,265,000   10,203,000  
Loan Agreement                        
Debt Instrument [Line Items]                        
Notes issued, aggregate principal amount       $ 2,500,000                
Notes issued, interest rate       4.25%                
Long-term debt           1,300,000     1,300,000      
Current portion of long-term debt           500,000     500,000      
Debt Instrument, Maturity Date, Description       matures in March 2018                
Convertible Senior Notes                        
Debt Instrument [Line Items]                        
Notes issued, aggregate principal amount         $ 150,000,000              
Notes issued, interest rate         3.375%              
Debt Instrument Maturity Year         2018              
Convertible Senior Notes | Walker Group Holdings Llc [Member]                        
Debt Instrument [Line Items]                        
Proceeds from issuance of convertible senior notes                 $ 145,100,000      
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      
Unsecured Debt | Convertible Senior Notes | Scenario 1                        
Debt Instrument [Line Items]                        
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]                        
Interest Paid                 $ 7,100,000 7,900,000    
Current portion of long-term debt           1,900,000     1,900,000      
Debt issuance costs paid                 900,000      
Interest expense                 200,000 700,000    
Other Expenses                 5,300,000      
Debt Instrument, Periodic Payment, Principal                 1,000,000 $ 42,100,000    
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Notes issued, aggregate principal amount $ 150,000,000                      
Credit facility, borrowing capacity $ 175,000,000                      
Line of Credit Facility, Remaining Borrowing Capacity           366,000,000     366,000,000      
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 8, 2017 to June 4, 2020                      
Proceeds from Sale of Property, Plant, and Equipment               $ 13,100,000        
Debt Instrument Payment Description               Further, a mandatory principal payment is required for asset sales greater than $10.0 million, with the amount of the required payment equal to the excess above $10.0 million, or $3.1 million        
Line of Credit Facility, Maximum Amount Outstanding During Period                 100,000      
Revolving Credit Facility | LIBOR                        
Debt Instrument [Line Items]                        
Debt Instrument, Description of Variable Rate Basis 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                      
Term Loan Credit Facilty                        
Debt Instrument [Line Items]                        
Notes issued, aggregate principal amount           191,881,000     191,881,000   $ 192,845,000  
Line of credit facility potential term extension period   91 days                    
Percentage of tranche loan amount on equal quarterly installments   0.25%                    
Debt Instrument Payment Percentage   1.00%                    
Term Loan Credit Facilty | LIBOR                        
Debt Instrument [Line Items]                        
Debt Instrument, Maturity Date, 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 | Tranche B-2 Loans [Member]                        
Debt Instrument [Line Items]                        
Notes issued, aggregate principal amount   $ 192,800,000                    
Credit facility, maturity date   Mar. 19, 2022                    
Term Loan Credit Facilty | Senior Secured Credit Facility                        
Debt Instrument [Line Items]                        
Line of Credit Facility, Amount Outstanding                       $ 300,000,000
Term Loan Credit Facilty | Incremental Senior Credit Facility                        
Debt Instrument [Line Items]                        
Credit facility, borrowing capacity     $ 75,000,000                  
Senior Secured Leverage Ratio     3.00 to 1.00                  
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 Agreement [Member]                        
Debt Instrument [Line Items]                        
Prepaid Expense and Other Assets, Current           192,022,000,000     192,022,000,000      
Amounts Reinvest on Qualified Assets           $ 2,000,000     $ 2,000,000      
Minimum                        
Debt Instrument [Line Items]                        
Debt Conversion, Converted Instrument, Amount   $ 125,000,000