Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Additional Information (Detail)

v3.6.0.2
Long-Term Debt - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 22, 2014
Jul. 30, 2013
Apr. 18, 2013
Debt Instrument [Line Items]                
Repayments of long-term debt     $ 0 $ 30,000,000 $ 435,000,000      
Debt issuance costs $ 2,200,000 $ 1,400,000            
Payments of debt issuance costs     $ 0 $ 1,996,000 $ 7,630,000      
Secured Debt [Member]                
Debt Instrument [Line Items]                
Revolving loan outstanding           $ 40,000,000    
7.50 % Senior Notes [Member]                
Debt Instrument [Line Items]                
Aggregate principal amount             $ 225,000,000  
Debt instrument fixed interest rate             7.50%  
Secured Debt [Member] | Goldman Term Loan [Member]                
Debt Instrument [Line Items]                
Aggregate principal amount               $ 125,000,000