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Quarterly Financial Summary (Unaudited) - Schedule of Quarterly Financial Summary (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenue (1)	$ 174,207us-gaap_Revenues	$ 182,825us-gaap_Revenues	$ 186,172us-gaap_Revenues	$ 198,154us-gaap_Revenues	$ 199,373us-gaap_Revenues	$ 199,079us-gaap_Revenues	$ 212,574us-gaap_Revenues	$ 228,655us-gaap_Revenues	$ 741,358us-gaap_Revenues	$ 839,681us-gaap_Revenues	$ 1,019,903us-gaap_Revenues
Operating loss (1)	(7,784)us-gaap_OperatingIncomeLoss	(31,732)us-gaap_OperatingIncomeLoss	(11,251)us-gaap_OperatingIncomeLoss	(21,949)us-gaap_OperatingIncomeLoss	(14,429)us-gaap_OperatingIncomeLoss	(30,563)us-gaap_OperatingIncomeLoss	(30,279)us-gaap_OperatingIncomeLoss	(5,570)us-gaap_OperatingIncomeLoss	(72,716)us-gaap_OperatingIncomeLoss	(80,841)us-gaap_OperatingIncomeLoss	(69,690)us-gaap_OperatingIncomeLoss
Net loss	$ (25,488)us-gaap_NetIncomeLoss	$ (47,968)us-gaap_NetIncomeLoss	$ (46,564)us-gaap_NetIncomeLoss	$ (58,143)us-gaap_NetIncomeLoss	$ (30,606)us-gaap_NetIncomeLoss	$ (87,064)us-gaap_NetIncomeLoss	$ (31,390)us-gaap_NetIncomeLoss	$ (15,203)us-gaap_NetIncomeLoss	$ (178,163)us-gaap_NetIncomeLoss	$ (164,263)us-gaap_NetIncomeLoss	$ (142,796)us-gaap_NetIncomeLoss
Net loss per share (2) Basic and Diluted	$ (0.38)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.71)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.69)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.87)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.46)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.30)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.47)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.23)us-gaap_EarningsPerShareBasicAndDiluted	$ (2.65)us-gaap_EarningsPerShareBasicAndDiluted	$ (2.46)us-gaap_EarningsPerShareBasicAndDiluted	$ (2.15)us-gaap_EarningsPerShareBasicAndDiluted

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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