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Long-Term Borrowings - Additional Information (Detail) - 6.625% senior notes due 2021 [Member] - Senior notes [Member] - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 18, 2013
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Aggregate principal amount $ 225,000,000      
Interest rate 6.625% 6.625% 6.625% 6.625%
Due date Jul. 15, 2021   Jul. 15, 2021 Jul. 15, 2021
Aggregate principal amount of senior notes pricing 99.50%      
Percentage of redeem aggregate principal amount of Notes issued   35.00% 35.00%  
Redemption price plus accrued, unpaid interest and special interest to the date of redemption     106.625%  
Redemption price     100.00%  
Debt instrument, covenant terms     The Company did not cure the Initial Reporting Defaults within the applicable 60-day grace period and the Initial Reporting Defaults ripened into Events of Default.  
Interest rate additional to base rate     0.25%  
Maximum [Member]        
Debt Instrument [Line Items]        
Debt acceleration period     180 days  
2017 [Member]        
Debt Instrument [Line Items]        
Redemption price plus accrued, unpaid interest and special interest to the date of redemption     103.313%  
2018 [Member]        
Debt Instrument [Line Items]        
Redemption price plus accrued, unpaid interest and special interest to the date of redemption     101.656%  
2019 [Member]        
Debt Instrument [Line Items]        
Redemption price plus accrued, unpaid interest and special interest to the date of redemption     100.00%  
Interest Expense [Member]        
Debt Instrument [Line Items]        
Amortization costs   $ 133,000 $ 265,000  
Other non-current assets [Member]        
Debt Instrument [Line Items]        
Remaining capitalized costs   $ 4,055,000 $ 4,055,000