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Income Taxes - Schedule of Net Operating Loss Expiration (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	$ 140,959
2018 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	5,819
2019 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	5,101
2021 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	579
2023 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	608
2024 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	2,330
2025 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	3,239
2026 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	15,560
2027 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	24,655
2028 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	19,754
2029 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	14,218
2030 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	6,385
2031 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	6,052
2032 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	32,215
2033 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss expiration amount	$ 4,444