Amount for accounts payable to related parties.

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Related Party Transactions (Detail) - USD ($) $ in Thousands			12 Months Ended
	Feb. 26, 2016	Dec. 04, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2015
Related Party Transaction [Line Items]
Accounts payable to affiliate, net			$ 3,349	$ 2,291
Cost of sales, related party transactions			29,596	40,206	$ 37,007
Distribution received from equity method investee			$ 3,300	0	4,835
ICP [Member]
Related Party Transaction [Line Items]
Distribution received from equity method investee	$ 3,300	$ 4,835
Equity method ownership percentage (percent)	30.00%		30.00%			30.00%
ICP [Member]
Related Party Transaction [Line Items]
Cost of sales, related party transactions			$ 29,596	$ 39,738	$ 35,254