| Intangible Assets and Goodwill - Definite Life Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | 
|---|---|---|
| Finite-Lived Intangible Assets [Line Items] | ||
| Less accumulated amortization | $ (11,985) | $ (11,342) | 
| Definite life intangibles, net | 5,333 | 5,976 | 
| Favorable Lease Agreements [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Definite life intangibles, gross | $ 17,318 | $ 17,318 | 
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Details 
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