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Calculation of Net Income (Loss) and Number of Shares Used to Compute Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]      
Net loss $ (162,602)us-gaap_NetIncomeLoss $ (274,158)us-gaap_NetIncomeLoss $ (220,872)us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic and diluted 186,835us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 183,575us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 164,964us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share - basic and diluted $ (0.87)us-gaap_EarningsPerShareBasicAndDiluted $ (1.49)us-gaap_EarningsPerShareBasicAndDiluted $ (1.34)us-gaap_EarningsPerShareBasicAndDiluted