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Revenue Recognition Policy (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013 unit contract	Dec. 31, 2012 contract
Number of contracts in progress that were identified as a loss contract (in contracts)	2	2
Loss on contract termination	$ 1	$ 57
Unbilled receivables, current	22,569	15,661
Billings in excess of cost, current	$ 1,614	$ 1,703
Number of units with APC technology (in units)	700
Minimum [Member]
Contract term (in months)	8 months
Critical operational measurements (in measurements)	3
Maximum [Member]
Contract term (in months)	16 months
Critical operational measurements (in measurements)	4

Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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