Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

v3.7.0.1
Long-Term Debt - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Jan. 26, 2015
Jan. 22, 2014
Jul. 30, 2013
Debt Instrument [Line Items]                
Senior secured credit facility $ 82,300,000   $ 82,300,000          
Consolidated Leverage Covenant - Eurodollar Rate     4.00%          
Consolidated Leverage Covenant - Base Rate     3.00%          
Line of Credit Facility, Maximum Borrowing Capacity 50,000,000   $ 50,000,000          
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust 75,000,000   75,000,000          
Interest Expense 11,095,000 $ 12,187,000 21,965,000 $ 23,749,000        
Long-term Debt 585,000,000   585,000,000   $ 585,000,000      
2015 Secured Credit Agreement [Member]                
Debt Instrument [Line Items]                
Deferred acquisition costs 1,000,000   1,000,000          
Senior secured credit facility 100,000,000   100,000,000     $ 200,000,000.0    
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Letters of credit outstanding 5,800,000   5,800,000          
6.75% Senior Notes, due July 2022 [Member]                
Debt Instrument [Line Items]                
Aggregate principal amount             $ 360,000,000  
Percentage of notes guaranteed by restricted subsidiaries             6.75%  
Redemption price after year three             103.375%  
Redemption price afer year five             101.00%  
Debt issuance costs     7,600,000          
Debt issuance cost, Net of amortization     5,000,000          
Long-term Debt 360,000,000   360,000,000   360,000,000      
7.50% Senior Notes, due August 2020 [Member]                
Debt Instrument [Line Items]                
Aggregate principal amount               $ 225,000,000.0
Percentage of notes guaranteed by restricted subsidiaries               7.50%
Deferred acquisition costs 2,800,000   2,800,000         $ 5,600,000
Redemption price afer year five               101.00%
Long-term Debt $ 225,000,000   $ 225,000,000   $ 225,000,000