Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Shareholders Equity [Line Items]
Beginning balance, value	$ 407,024us-gaap_StockholdersEquity
Net loss	(1,137)us-gaap_NetIncomeLoss	9,638us-gaap_NetIncomeLoss
Dividends	(7,442)us-gaap_Dividends
Stock-based employee compensation expense, Value	268
Ending balance, value	398,713us-gaap_StockholdersEquity
Common Stock [Member]
Shareholders Equity [Line Items]
Beginning balance, value	334
Beginning balance, shares	33,417,203
Stock-based employee compensation expense, Value	0
Ending balance, value	334
Ending balance, shares	33,417,203
Paid-in-Capital [Member]
Shareholders Equity [Line Items]
Beginning balance, value	463,314
Stock-based employee compensation expense, Value	268
Ending balance, value	463,582
Dividends Paid in Excess of Earnings [Member]
Shareholders Equity [Line Items]
Beginning balance, value	(56,624)
Net loss	(1,137)
Dividends	(7,442)
Ending balance, value	$ (65,203)

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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