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Debt - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 27, 2017
USD ($)
Sep. 26, 2017
USD ($)
Feb. 24, 2017
Jun. 30, 2015
USD ($)
May 31, 2012
USD ($)
Apr. 30, 2012
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]                        
Long-term debt             $ 558,120,000     $ 558,120,000   $ 239,097,000
Interest expense             3,187,000   $ 3,906,000 9,065,000 $ 11,938,000  
Gains (losses) on extinguishment of debt, total                   (767,000) (487,000)  
Amortization of Debt Issuance Costs and Discounts                   100,000 100,000  
Shareholders' Equity                        
Debt Instrument [Line Items]                        
Debt instrument, repurchase amount             4,100,000     4,100,000   82,000,000
Debt instrument, repurchased face amount             7,500,000     7,500,000    
Business combination, recognized identifiable assets acquired and liabilities assumed, current liabilities, long-term debt                       98,900,000
Gains (losses) on extinguishment of debt, total               $ 600,000   $ 100,000 500,000  
Convertible Senior Notes                        
Debt Instrument [Line Items]                        
Notes issued, aggregate principal amount           $ 150,000,000            
Notes issued, interest rate           3.375%            
Proceeds from Notes Payable           $ 145,100,000            
Convertible Senior Notes | Walker Group Holdings LLC                        
Debt Instrument [Line Items]                        
Debt Instrument Maturity Year           2018            
Unsecured Debt                        
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    
Unsecured Debt | Convertible Senior Notes                        
Debt Instrument [Line Items]                        
Notes issued, aggregate principal amount             $ 150,000,000     $ 150,000,000    
Number of consecutive trading days                   30 days    
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                   43,000,000    
Amended Credit Agreement                        
Debt Instrument [Line Items]                        
Interest Paid                   5,700,000 $ 6,200,000  
Long-term debt             1,400,000     1,400,000    
Senior Notes [Member]                        
Debt Instrument [Line Items]                        
Notes issued, aggregate principal amount   $ 325,000,000                    
Notes issued, interest rate 5.50%                      
Notes issued, interest payment frequency   The Senior Notes bear interest at the rate of 5.50% per annum from the date of issuance, and will pay interest semi-annually in cash on April 1 and October 1 of each year, beginning on April 1, 2018                    
Fair value of liability component upon issuance             319,309,000     319,309,000   0
Credit facility, maturity date Oct. 01, 2025 Oct. 01, 2025                    
Long-term debt             325,000,000     325,000,000   0
Interest expense                   $ 200,000    
Proceeds from Issuance of Senior Long-term Debt $ 325,000,000 $ 318,900,000                    
Debt Instrument, Redemption, Description   The Senior Notes will mature on October 1, 2025. At any time prior to October 1, 2020, the Company may redeem some or all of the Senior Notes for cash at a redemption price equal to 100% of the aggregate principal amount of the Senior Notes being redeemed plus an applicable make-whole premium set forth in theindenture for the Senior Notes and accrued and unpaid interest to, but not including, the redemption date. Prior to October 1, 2020, the Company may redeem up to 40% of the Senior Notes at a redemption price of 105.50% of the principal amount, plus accrued and unpaid interest to, but not including, the redemption date, with the proceeds of certain equity offerings so long as if, after any such redemption occurs, at least 60% of the aggregate principal amount of the Senior Notes remains outstanding. On and after October 1, 2020, the Company may redeem some or all of the Senior Notes at redemption prices (expressed as percentages of principal amount) equal to 102.750% for the twelve-month period beginning on October 1, 2020, 101.375% for the twelve-month period beginning October 1, 2021, and 100.000% beginning on October 1, 2022, plus accrued and unpaid interest to, but not including, the redemption date. Upon the occurrence of a Change of Control (as defined in the indenture for the Senior Notes), unless the Company has exercised its optional redemption right in respect of the Senior Notes, the holders of the Senior Notes have the right to require the Company to repurchase all or a portion of the Senior Notes at a price equal to 101% of the aggregate principal amount of the Senior Notes, plus any accrued and unpaid interest to, but not including, the date of repurchase.                    
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Credit facility, maturity date                   Jun. 04, 2020    
Credit facility, interest rate above basis       12.50%                
Line of Credit Facility, Remaining Borrowing Capacity             323,300,000     $ 323,300,000    
Debt Instrument, Term       5 years                
Debt Instrument, Description of Variable Rate Basis                   The Revolving Credit Facility (i) bears interest, at the Borrowers’ election, at (x) LIBOR (subject to a floor of 0%) plus a margin ranging from 150 basis points to 200 basis points, or (y) a base rate plus a margin ranging from 50 basis points to 100 basis points, in each case, based upon the monthly average excess availability under the Revolving Credit Facility, (ii) requires the Company to pay a monthly unused line fee equal to 25 basis points times the average unused availability under the Revolving Credit Facility, (iii) provides that if availability under the Revolving Credit Facility is less than 12.5% of the total commitment under the Revolving 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 Revolving Credit Facility, and (iv) requires the Company to maintain a minimum fixed charge coverage ratio of not less than 1.1 to 1.0 as of the end of any period of 12 fiscal months when excess availability under the Revolving Credit Facility is less than 10% of the total commitment under the Revolving Credit Facility.    
Line of Credit Facility, Borrowing Capacity, Description                   an uncommitted accordion feature allowing for an increase to the availability under the revolving credit facility of up to $50 million, subject to certain conditions    
Revolving Credit Facility | Senior Secured Credit Facility                        
Debt Instrument [Line Items]                        
Notes issued, aggregate principal amount       $ 175,000,000                
Term Loan Credit Facility                        
Debt Instrument [Line Items]                        
Long-term debt             188,049,000     $ 188,049,000   $ 189,470,000
Term Loan Credit Facility | Incremental Senior Credit Facility                        
Debt Instrument [Line Items]                        
Senior Secured Leverage Ratio                   3.0 to 1.0    
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             $ 188,000,000     $ 188,000,000    
Debt Instrument, Periodic Payment, Principal                   $ 1,900,000    
Term Loan Credit Agreement | Senior Secured Credit Facility                        
Debt Instrument [Line Items]                        
Credit facility, maturity date         Mar. 19, 2022              
Line of Credit Facility, Amount Outstanding         $ 189,500,000              
Debt Instrument, Description of Variable Rate Basis         (i) LIBOR (subject to a floor of 0%) plus a margin of 275 basis points or (ii) a base rate plus a margin of 175 basis points.              
Debt Instrument, Description         an uncommitted accordion feature to provide for additional senior secured term loans of up to $75 million plus an unlimited amount provided that the senior secured leverage ratio would not exceed 3.00 to 1.00, subject to certain conditions              
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       150     1.0     1.0    
Maximum | Revolving Credit Facility | Amended and Restated Credit Agreement                        
Debt Instrument [Line Items]                        
Fixed Charge Coverage Ratio Minimum       1.1