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Quarterly Financial Data - Condensed Consolidated Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Interim Reporting [Line Items]                  
Total assets $ 423,182 $ 430,058 $ 459,450 $ 475,758 $ 472,897 $ 539,566 $ 530,395 $ 694,106  
Total liabilities 112,688 111,001 114,223 102,366 105,065 193,599 205,196 381,734  
Total shareholders' equity 310,494 319,057 345,227 373,392 367,832 345,967 325,199 312,372 292,074
Total liabilities and shareholders' equity 423,182 430,058 459,450 475,758 472,897 539,566 530,395 694,106  
As Previously or Currently Reported [Member]
                  
Interim Reporting [Line Items]                  
Total assets          503,380 504,281 565,073 553,320 707,586  
Total liabilities          101,212 105,183 187,463 199,104 369,178  
Total shareholders' equity          402,168 399,098 377,610 354,216 338,408  
Total liabilities and shareholders' equity          503,380 504,281 565,073 553,320 707,586  
Restatement Adjustments [Member]
                  
Interim Reporting [Line Items]                  
Total assets          (27,622) (31,384) (25,507) (22,925) (13,480)  
Total liabilities          1,154 (118) 6,136 6,092 12,556  
Total shareholders' equity          (28,776) (31,266) (31,643) (29,017) (26,036)  
Total liabilities and shareholders' equity          $ (27,622) $ (31,384) $ (25,507) $ (22,925) $ (13,480)