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Non-controlling Interest - Non-controlling Interest (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Noncontrolling Interest [Abstract]
Balance at beginning of period	$ 1,842	$ 1,108
Net income attributable to non-controlling interest in consolidated subsidiary	20	52
Purchase of non-controlling interest in consolidated subsidiary	(1,084)
Balance at end of period		$ 1,160

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

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