Annual report pursuant to Section 13 and 15(d)

Discontinued Operations - Summary of Operations and Disposal Group for Discontinued Operations (Detail)

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Discontinued Operations - Summary of Operations and Disposal Group for Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Discontinued Operations [Line Items]      
Revenues $ 493,233 $ 430,065 $ 301,785
Income from discontinued operations before taxes 46,576 22,862 12,296
Gain on disposal of discontinued operations before taxes 17,962    
Provision for income taxes (47,603) (8,858) (1,813)
Income from discontinued operations, net of taxes $ 16,935 $ 14,004 $ 10,483