Fair Value Measurements (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Marketable Securities, Current	$ 9	$ 19
APC Technology Segment | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,451	7,144	$ 0
Impairment Losses	(2,074)	(1,425)	(23,400)
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Goodwill
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	3,451	7,144	0
Impairment Losses	(2,074)	(1,425)	(23,400)
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 1 | Goodwill
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 2 | Goodwill
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5,525	8,569	23,400
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 3 | Goodwill
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 5,525	$ 8,569	$ 23,400