Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Percentage of vesting of share-based compensation awards.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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Number of shares held for each class of treasury stock.

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Stock-Based Compensation - Performance-based Equity Awards - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	May. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense		$ 700,000	$ 700,000	$ 1,400,000	$ 2,600,000
Vice President [Member] \| Nexgen Wireless, Inc. [Member] \| Vest on February 27, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting right	50.00%
Vice President [Member] \| Nexgen Wireless, Inc. [Member] \| Vest on February 27, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting right	50.00%
2014 LTIP - One-year Revenue Goals [Member] \| Performance Based Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense				0
Aggregate intrinsic value of shares vested				50,000
2015 Long-Term Incentive Plan [Member] \| Performance Based Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense				$ 0
Minimum [Member] \| 2014 LTIP - One-year Revenue Goals [Member] \| Performance Based Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares earned		190,000		190,000
Minimum [Member] \| 2015 Long-Term Incentive Plan [Member] \| Performance Based Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares earned		212,000		212,000
Maximum [Member] \| Vice President [Member] \| Nexgen Wireless, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	50,000
Maximum [Member] \| 2014 LTIP - One-year Revenue Goals [Member] \| Performance Based Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares earned		380,000		380,000
Maximum [Member] \| 2015 Long-Term Incentive Plan [Member] \| Performance Based Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares earned		424,000		424,000