Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data - Schedule of Selected Quarterly Financial Data (Detail)

v2.4.0.6
Selected Quarterly Financial Data - Schedule of Selected Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Selected Quarterly Financial Data [Line Items]                      
Revenues $ 157,187 $ 165,301 $ 178,925 $ 176,569 $ 181,066 $ 176,589 $ 172,812 $ 156,179 $ 677,982 $ 686,646 $ 659,475
Operating gross margin 16,405 34,038 46,440 54,018 44,399 49,966 40,797 21,204 150,901 156,366 73,167
Operating income (8,317) 25,739 40,388 49,013 (133,215) 41,959 33,215 15,402 106,823 (42,639) 45,107
Net income (loss) attributable to controlling interest $ (20,098) $ 10,936 $ 20,083 $ 26,392 $ (90,176) $ 20,725 $ 14,173 $ 4,827 $ 37,313 $ (50,451) $ (14,461)
Basic earnings per share-net income (loss) $ (0.17) $ 0.09 $ 0.17 $ 0.23 $ (0.77) $ 0.18 $ 0.12 $ 0.04 $ 0.32 $ (0.43) $ (0.13)
Diluted earnings per share-net income (loss) $ (0.17) $ 0.09 $ 0.17 $ 0.22 $ (0.77) $ 0.18 $ 0.12 $ 0.04 $ 0.31 $ (0.43) $ (0.13)