Long-term Borrowings - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended		12 Months Ended	0 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2013	Jul. 18, 2013	Dec. 31, 2012	May 16, 2011	Apr. 09, 2010
Debt Instrument [Line Items]
Net proceeds from senior notes	$ 218,836,000
Original debt issue discount	1,077,000	2,302,000	1,077,000		2,038,000
Loss on early extinguishment of senior notes	(32,812,000)	(5,459,000)
6.625% senior notes due 2021 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	225,000,000		225,000,000	225,000,000
Interest rate	6.625%	6.625%	6.625%	6.625%	6.625%
Due date	Jul. 15, 2021	Jul. 15, 2021		Jul. 15, 2021	Jul. 15, 2021
Aggregate principal amount of senior notes pricing				99.50%
Net proceeds from senior notes			218,800,000	218,800,000
Original debt issue discount	1,100,000		1,100,000	1,100,000
Debt issuance costs paid			5,100,000	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%
6.625% senior notes due 2021 [Member] | Other non-current assets [Member]
Debt Instrument [Line Items]
Remaining capitalized costs	4,822,000		4,822,000
6.625% senior notes due 2021 [Member] | Amortization costs [Member]
Debt Instrument [Line Items]
Interest expense, net	217,000
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]
Aggregate principal amount						250,000,000	250,000,000
Interest rate	10.50%	10.50%	10.50%		10.50%		10.50%
Due date	Apr. 15, 2018	Apr. 15, 2018			Apr. 15, 2018	Apr. 15, 2018	Apr. 15, 2018
Aggregate principal amount of senior notes pricing							98.674%
Loss on early extinguishment of senior notes		5,460,000
Repurchase premium on senior notes		3,998,000
Write-off of discounts, senior notes		554,000
Write-off of debt issuance costs		609,000
Additionally repurchased senior notes		46,300,000
Direct legal and advisory service fees		$ 299,000