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Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income (loss)	$ (241)us-gaap_ProfitLoss	$ 2,935us-gaap_ProfitLoss
(Income) loss allocated to non-controlling interests	8us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) allocable to common shares	$ (233)us-gaap_NetIncomeLoss	$ 2,935us-gaap_NetIncomeLoss
Weighted-average shares outstanding-Basic	31,768,468us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	15,198,096us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive securities under the treasury stock method		15,855us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted-average shares outstanding-Diluted	31,768,468us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	15,213,951us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings (loss) per share-Basic	$ (0.01)us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic
Earnings (loss) per share-Diluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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