Summary of Revenues and Earnings (Losses) of Discontinued Operation (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Earnings (loss) from discontinued operation, net of taxes	$ 131	$ 2	$ 133	$ (6,789)
Tellurium product line
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Revenues			1,849	7,321
Earnings (loss) from discontinued operation before income taxes			133	(6,789)
Earnings (loss) from discontinued operation, net of taxes			$ 133	$ (6,789)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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