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Stockholders' Equity - Summary of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity (Detail) - Jun. 30, 2015 - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Total
Schedule Of Restricted Stock Restricted Stock Unit And Performance Stock Unit Activity [Line Items]
Weighted Average Grant Price, Outstanding, December 31, 2014	$ 4.79
Weighted Average Grant Price, Granted	4.20
Weighted Average Grant Price, Forfeited	5.11
Weighted Average Grant Price, Outstanding, June 30, 2015	4.40
Weighted Average Grant Price, Expected to vest, June 30, 2015	$ 4.40
Weighted Average Remaining Contractual Term, Outstanding	2 years 2 months 12 days
Weighted Average Remaining Contractual Term, Expected to vest	2 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding, June 30, 2015	$ 1,252
Aggregate Intrinsic Value, Expected to vest, June 30, 2015	$ 1,029
Restricted Stock, Restricted Stock Units and Performance Stock Units [Member]
Schedule Of Restricted Stock Restricted Stock Unit And Performance Stock Unit Activity [Line Items]
Restricted Stock, Restricted Stock Units, and Performance Stock Units Outstanding, December 31, 2014	1,048
Restricted Stock, Restricted Stock Units, and Performance Stock Units, Granted	562
Restricted Stock, Restricted Stock Units, and Performance Stock Units, Forfeited	(280)
Restricted Stock, Restricted Stock Units, and Performance Stock Units Outstanding, June 30, 2015	1,024
Restricted Stock, Restricted Stock Units, and Performance Stock Units Expected to vest, June 30, 2015	844
Class A Common Stock [Member]
Schedule Of Restricted Stock Restricted Stock Unit And Performance Stock Unit Activity [Line Items]
Weighted Average Grant Price Common Stock, vested	$ 4.72
Class A Common Stock [Member] | Restricted Stock, Restricted Stock Units and Performance Stock Units [Member]
Schedule Of Restricted Stock Restricted Stock Unit And Performance Stock Unit Activity [Line Items]
Restricted Stock, Restricted Stock Units, and Performance Stock Units Common Stock, vested	(306)

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Schedule Of Restricted Stock Restricted Stock Unit And Performance Stock Unit Activity [Line Items]

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Intrinsic value of equity-based awards excluding options expected to vest.

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The number of equity-based awards other than stock options that are expected to vest.

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The weighted average fair value as of the grant date of equity-based awards other than stock options for awards that are expected to vest.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMns' format, that are expected to vest.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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

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