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Debt - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 03, 2017
Apr. 30, 2017
Sep. 30, 2016
 [1]
Sep. 30, 2017
Sep. 30, 2016
Aug. 17, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]              
Loss on debt extinguishment     $ 2,589,000 $ 39,639,000 $ 2,589,000 [1]    
Cash paid for call premium   $ 31,600,000          
Write-off of unamortized debt issuance costs       8,054,000 $ 2,589,000    
Incremental Term Loan [Member]              
Line of Credit Facility [Line Items]              
Debt instrument face amount $ 300,000,000     $ 300,000,000      
Interest rate 0.75%            
LIBOR Period       1 month      
Basis spread on variable rate 3.75%     3.75%      
Debt maturity date       Apr. 03, 2021      
Debt instrument periodic payment $ 3,000,000            
Debt instrument frequency of periodic payment       Quarterly      
Senior Secured Revolving Facility [Member]              
Line of Credit Facility [Line Items]              
Loss on debt extinguishment 2,500,000            
Write-off of unamortized debt issuance costs 800,000            
Borrowings       $ 143,000,000      
Senior secured revolving credit facility current borrowing capacity 100,000,000            
Debt issuance costs 6,500,000            
Direct reduction to carrying amount of debt 4,000,000            
Outstanding balance           $ 33,200,000 $ 27,977,000
Senior Notes [Member]              
Line of Credit Facility [Line Items]              
Outstanding amount of notes redeemed 281,600,000            
Loss on debt extinguishment 36,300,000            
Cash paid for call premium 31,600,000            
Write-off of unamortized debt issuance costs $ 4,700,000            
[1] Includes the effects of discontinued operations (Note 2) and prior periods' revisions (Note 1 and Note 15)