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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) (USD $)
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12 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Amended Senior Term Facility [Member]
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Dec. 31, 2012
Amended Senior Term Facility [Member]
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Dec. 31, 2013
Alaska Facility [Member]
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Dec. 31, 2012
Alaska Facility [Member]
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Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
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Dec. 31, 2012
Class A Preferred Stock [Member]
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Dec. 31, 2011
Class A Preferred Stock [Member]
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Jun. 21, 2013
IPO [Member]
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Jun. 21, 2013
IPO [Member]
Class A Preferred Stock [Member]
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Dec. 31, 2013
IPO [Member]
Class A Preferred Stock [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||||||||
| Carrying value of Long term debt | $ 240,800,000 | $ 133,300,000 | $ 1,500,000 | $ 2,000,000 | |||||||||
| Fair value of Long term debt | 261,000,000 | ||||||||||||
| Common Stock Shares Issued | 11,000,000 | 2,135,602 | 2,135,602 | ||||||||||
| Initial Public Offering (IPO) price per share | $ 17.00 | ||||||||||||
| Value of liquidation preference | 36,305,000 | (9,640,000) | (58,740,000) | (9,640,000) | (25,650,000) | 36,305,000 | (36,305,000) | ||||||
| Fair value measurement related to derivative liabilities | $ 0 | ||||||||||||