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Debt - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended
May 03, 2017
Feb. 24, 2017
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Apr. 30, 2013
USD ($)
Apr. 30, 2012
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
May 31, 2012
USD ($)
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount               $ 233,825,000   $ 239,097,000  
Line of credit facility, decrease, repayments               371,000 $ 316,000    
Gains (losses) on extinguishment of debt, total               (764,000) (487,000)    
Shareholders' Equity                      
Debt Instrument [Line Items]                      
Debt instrument, repurchase amount               4,000,000   82,000,000  
Debt instrument, repurchased face amount               7,300,000      
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      
Notes initial conversion price | $ / shares               $ 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      
Estimated implied interest rate               7.00%      
Fair value of liability component upon issuance               $ 123,800,000      
Difference between cash proceeds before offering expenses and the estimated fair value of liability component               21,700,000      
Proceeds from issuance of convertible senior notes               145,500,000      
Debt Conversion, Converted Instrument, Amount               $ 39,000,000      
Unsecured Debt | Convertible Senior Notes | Scenario 1                      
Debt Instrument [Line Items]                      
Number of consecutive trading days               30 days      
Amended Credit Agreement                      
Debt Instrument [Line Items]                      
Interest Paid               $ 3,800,000 4,200,000    
Long-term debt               900,000 $ 1,000,000    
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               $ 348,200,000      
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 (1) the sum of (A) unrestricted cash and cash equivalents and (B) availability under the Credit Facility and (2) 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               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 | Amended and Restated Credit Agreement                      
Debt Instrument [Line Items]                      
Line Of Credit Facility Amendment Description the Company entered into the Second Amendment to Amended and Restated Credit Agreement (the Second Amendment). The Second Amendment provides for revisions to the asset sale and lien covenants that conform certain provisions of the Credit Agreement to corresponding provisions of the Companys Term Loan Credit Agreement (see below) by, among other things, (i) increasing amounts allowed per calendar year for certain asset sales from $20 million to the greater of $30 million and 5.0% of consolidated tangible assets, (ii) permitting the proceeds of such increased amount of asset sales to be reinvested in lieu of making mandatory prepayments of indebtedness and (iii) increasing the time permitted for incurring purchase money debt following the acquisition of assets financed thereby from 20 days to 180 days.                    
Revolving Credit Facility | Senior Secured Credit Facility                      
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount     $ 175,000,000         $ 75,000,000      
Term Loan Credit Facility                      
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount               $ 188,522,000   $ 189,470,000  
Line of credit facility potential term extension period       91 days              
Term Loan Credit Facility | LIBOR                      
Debt Instrument [Line Items]                      
Debt Instrument, Maturity Date, Description   LIBOR (subject to a floor of 0%) plus a margin of 2.75% or (ii) a base rate (subject to a floor of 0%) plus a margin of 1.75%                  
Percentage Of Prepayment Premium   1.00%                  
Term Loan Credit Facility | Incremental Senior Credit Facility                      
Debt Instrument [Line Items]                      
Senior Secured Leverage Ratio               3.0 to 1.0      
Term Loan Credit Facility | 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 Facility | Tranche B One Loan [Member]                      
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount       $ 192,800,000              
Term Loan Credit Facility | Tranche B Two Loan [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%   0.25%              
Line of Credit Facility, Amount Outstanding               $ 188,500,000      
Debt Instrument, Periodic Payment, Principal               $ 1,900,000      
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 Agreement | Senior Secured Credit Facility                      
Debt Instrument [Line Items]                      
Line of Credit Facility, Amount Outstanding                     $ 300,000,000
Term Loan Credit Agreement | Tranche B Two Loan [Member]                      
Debt Instrument [Line Items]                      
Notes issued, aggregate principal amount   $ 189,500,000                  
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     150         1.0      
Maximum | Revolving Credit Facility | Amended and Restated Credit Agreement                      
Debt Instrument [Line Items]                      
Fixed Charge Coverage Ratio Minimum     1.1