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Schedule I - Condensed Statements of Comprehensive Income (Detail) (USD $) In Thousands, 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
Condensed Financial Statements, Captions [Line Items]
Net income	$ (25,446)us-gaap_NetIncomeLoss	$ 87,176us-gaap_NetIncomeLoss	$ 37,406us-gaap_NetIncomeLoss	$ (49,217)us-gaap_NetIncomeLoss	$ (12,969)us-gaap_NetIncomeLoss	$ 120,740us-gaap_NetIncomeLoss	$ (15,900)us-gaap_NetIncomeLoss	$ (39,951)us-gaap_NetIncomeLoss	$ 49,919us-gaap_NetIncomeLoss	$ 51,920us-gaap_NetIncomeLoss	$ 74,221us-gaap_NetIncomeLoss
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Equity in net income of subsidiary									49,919	51,920	74,221
Net income									49,919	51,920	74,221
Other comprehensive income									0	0	0
Comprehensive income									$ 49,919	$ 51,920	$ 74,221

The amount of net income (loss) reported by an equity method investment of the entity.

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