Related Party - Additional Information (Detail) - Beneficial Owner [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Related Party Transaction [Line Items]
Percentage of common stock by partners			20.00%
Related party lease expense	$ 0.1	$ 0.4

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration