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Related Party Transactions - Schedule of Amount of General and Administrative Costs and Expenses Recognized (Detail) (Omnibus Agreement [Member], USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Omnibus Agreement [Member]
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| Related Party Transaction [Line Items] | |||
| General and administrative costs and expenses under omnibus agreement | $ 24,372 | $ 9,440 | $ 1,771 |