Results of Operations of PVG (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Discontinued Operations and Disposal Groups [Abstract]
Revenues	$ 0		$ 0		$ 303,206
Income from discontinued operations before taxes	0		0		36,832
Income tax expense	0	[1]	0	[1]	(3,384)	[1]
Income from discontinued operations, net of taxes	$ 0	[2]	$ 0	[2]	$ 33,448	[2]

[1] Determined by applying the effective tax rate attributable to discontinued operations to the income from discontinued operations less noncontrolling interests attributable to PVG's operations.

[2] For purposes of determining earnings per share, net income attributable to noncontrolling interests is applied against income from discontinued operations as both are attributable to PVG's operations.