Equity Method Investments (Detail) - USD ($)				3 Months Ended									12 Months Ended
	Dec. 23, 2016	Feb. 26, 2016	Dec. 04, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Mar. 31, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 22, 2016	Apr. 09, 2015
Schedule of Equity Method Investments [Line Items]
Distribution received from equity method investee													$ 3,300,000	$ 0	$ 4,835,000
Divestiture of DMI													351,000	0	0
Equity method investment, other than temporary impairment													0	0	0
Related party expenses													27,675,000	38,941,000	36,289,000
Proceeds from business interruption insurance recoveries														4,112,000
Equity Method Investments				$ 18,934,000				$ 18,563,000					18,934,000	18,563,000
Equity In earnings (loss)				$ 1,776,000	$ 664,000	$ 1,079,000	$ 517,000	92,000	$ 1,562,000	$ 3,096,000	$ 1,352,000		4,036,000	6,102,000	10,137,000
ICP Limited Liability Company [Member]
Schedule of Equity Method Investments [Line Items]
EBITDA, earnings (loss)												$ (500,000)	$ (500,000)
ICP [Member]
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage (percent)		30.00%		30.00%					30.00%				30.00%
Income allocation to objecting member (as a percent)				80.00%									80.00%
Income allocation to electing member (as a percent)				20.00%									20.00%
Decrease in related equity method investment earnings due to reassessment															$ 1,882,000	$ 1,882,000
Increase (decrease) in earnings per share (in dollars per share)															$ (0.10)
Distribution received from equity method investee		$ 3,300,000	$ 4,835,000
Depreciation and amortization													$ 3,030,000	2,634,000	$ 2,847,000
ICP [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity																		$ 30,000,000
Future maximum borrowing capacity increase																		$ 20,000,000
ICP [Member] | ICP Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage by parent (as a percent)				70.00%									70.00%
D.M. Ingredients GmbH [Member]
Schedule of Equity Method Investments [Line Items]
Divestiture of DMI	$ 351,000
Equity Method Investments																	$ 384,000
D.M. Ingredients GmbH [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments				$ 0				$ 384,000					$ 0	384,000
Equity In earnings (loss)													$ (33,000)	$ (140,000)	$ 39,000