Long-term Borrowings - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Jul. 18, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014
Debt Instrument [Line Items]
Net proceeds from senior notes		$ 218,836,000
Original debt issue discount				993,000	1,077,000	993,000
Loss on early extinguishment of senior notes	32,812,000	32,812,000
6.625% senior notes due 2021 [Member]
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
Aggregate principal amount of senior notes pricing			99.50%
Net proceeds from senior notes			218,800,000
Original debt issue discount			1,100,000
Debt issuance costs paid			5,100,000
Loss on early extinguishment of senior notes				32,800,000
Repurchase premium on senior notes				23,800,000
Write-off of discounts, senior notes				1,900,000
Write-off of debt issuance costs				5,300,000
Interest incurred during the period				1,800,000
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.
Debt acceleration period				180 days
Interest rate additional to base rate				0.25%
Remaining capitalized costs				4,449,000		4,449,000
6.625% senior notes due 2021 [Member] | Amortization costs [Member]
Debt Instrument [Line Items]
Interest expense, net				$ 375,000		$ 128,000
6.625% senior notes due 2021 [Member] | 2017 [Member]
Debt Instrument [Line Items]
Redemption price plus accrued, unpaid interest and special interest to the date of redemption				103.313%
6.625% senior notes due 2021 [Member] | 2018 [Member]
Debt Instrument [Line Items]
Redemption price plus accrued, unpaid interest and special interest to the date of redemption				101.656%
6.625% senior notes due 2021 [Member] | 2019 [Member]
Debt Instrument [Line Items]
Redemption price plus accrued, unpaid interest and special interest to the date of redemption				100.00%
10.5% senior notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate				10.50%		10.50%
Due date				Apr. 15, 2018