Earnings Per Share - Schedule of Numerator and Denominator Used in Computation of Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Numerator:
Net loss attributable to common stockholders	$ (9,271)us-gaap_NetIncomeLoss	$ (13,423)us-gaap_NetIncomeLoss
Number of shares outstanding, end of period:
Unvested restricted stock	(159,000)	(130,000)
Effect of weighted average shares outstanding during period		(2,000)
Weighted average number of common shares used in basic and diluted EPS	40,417,000	39,909,000
Class A Common Stock [Member]
Number of shares outstanding, end of period:
Common stock shares outstanding	39,588,000	39,053,000	39,587,000
Class B Common Stock [Member]
Number of shares outstanding, end of period:
Common stock shares outstanding	988,000	988,000	988,000

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Shares issuable for little or no cash consideration upon the satisfaction of certain conditions (contingently issuable shares) are considered outstanding common shares and included in the computation of basic Earnings Per Share as of the date that all necessary conditions have been satisfied (in essence, when issuance of the shares is no longer contingent). Outstanding common shares that are contingently returnable (that is, subject to recall) are treated in the same manner as contingently issuable shares. Contingently issuable shares include shares that (a) will be issued in the future upon the satisfaction of specified conditions, (b) have been placed in escrow and all or part must be returned if specified conditions are not met, or (c) have been issued but the holder must return all or part if specified conditions are not met. The number of contingently issuable shares is determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.

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- Definition

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

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