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Long-Term Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Jul. 01, 2017
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Credit Agreement [Member]        
Line Of Credit Facility [Line Items]        
Amount of credit agreement $ 350,000,000      
Unused and available borrowings under credit agreement   $ 286,500,000 $ 286,500,000  
Credit agreement interest rate description     (i) LIBOR plus a specified margin based upon the Borrowers' total net leverage ratio (as defined in the Credit Agreement) (the "Total Net Leverage Ratio"), or (ii) the base rate (which is the highest of (a) the administrative agent's prime rate, (b) the federal funds rate plus 0.50% or (c) the sum of 1% plus one-month LIBOR) plus a specified margin based upon the Total Net Leverage Ratio.  
Commitment fee on unused commitments 0.25%      
Credit Agreement covenant terms     The Credit Agreement contains various restrictions and covenants, including negative covenants that limit or restrict dividends, indebtedness of subsidiaries, mergers and fundamental changes, asset sales, acquisitions, liens and encumbrances, transactions with affiliates, changes in fiscal year and other matters customarily restricted in such agreements. The Company must maintain a Total Net Leverage Ratio of (a) total funded debt as of such date, minus up to $50,000,000 in unrestricted cash and cash equivalents (each as defined in the Credit Agreement) to (b) consolidated EBITDA (as defined in the credit agreement) of not more than 3.00 to 1.00; provided that as of the close of each of the four fiscal quarters occurring after the consummation of a permitted acquisition (as defined in the Credit Agreement) with an aggregate consideration of $150,000,000 or more, such ratio shall not be more than 3.25 to 1.00. The Company must maintain an interest coverage ratio of consolidated EBITDA to consolidated cash interest expense of not less than 3.00 to 1.00. We incurred $1.4 million of financing costs related to the Credit Agreement during the third quarter of 2017, which we capitalized and will amortize to interest expense over the term of the agreement. The unamortized balance of $1.3 million is included in Other assets in the Unaudited Consolidated Balance Sheet as of September 30, 2017.  
Debt covenant permitted aggregate consideration $ 150,000,000      
Financing costs related to the credit agreement   1,400,000    
Credit Agreement [Member] | Other Assets [Member]        
Line Of Credit Facility [Line Items]        
Unamortized balance   1,300,000 $ 1,300,000  
Credit Agreement [Member] | Maximum [Member]        
Line Of Credit Facility [Line Items]        
Restricted cash and cash equivalents $ 50,000,000      
Total leverage ratio 3.00%      
Total leverage ratio for following four each fiscal quarters 3.25%      
Credit Agreement [Member] | Minimum [Member]        
Line Of Credit Facility [Line Items]        
Interest coverage ratio 3.00%      
Credit Agreement [Member] | Federal Funds Rate [Member]        
Line Of Credit Facility [Line Items]        
Interest rate under the credit agreement 0.50%      
Credit Agreement [Member] | LIBOR rate [Member]        
Line Of Credit Facility [Line Items]        
Interest rate under the credit agreement 1.00%      
Description of variable rate basis one-month LIBOR      
Credit Agreement [Member] | Eurodollar        
Line Of Credit Facility [Line Items]        
Interest rate under the credit agreement 2.00%      
Credit Agreement [Member] | Base Rate        
Line Of Credit Facility [Line Items]        
Interest rate under the credit agreement 1.00%      
2013 Credit Agreement [Member]        
Line Of Credit Facility [Line Items]        
Unused and available borrowings under credit agreement       $ 38,200,000
Letter of Credit        
Line Of Credit Facility [Line Items]        
Commitment fee on unused commitments 2.00%      
Standby Letters of Credit [Member]        
Line Of Credit Facility [Line Items]        
Letters of credit expiration year     2017  
Outstanding letters of credit   $ 13,500,000 $ 13,500,000