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Fair Value Measurements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated Fair value of long term debt	$ 116,000us-gaap_LongTermDebtFairValue	$ 123,000us-gaap_LongTermDebtFairValue
Carrying value of long term debt	117,670us-gaap_LongTermDebt	124,567us-gaap_LongTermDebt
Transfers in or out of Level 1, 2, or 3	0
7.75% Convertible notes due 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt instrument, interest rate percentage	7.75%	7.75%	7.75%
Carrying value of long term debt	$ 50,000	$ 50,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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