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Quarterly financial data - Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011
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Interim Reporting [Line Items] |  |  |  |  |  |  |  |
Total assets | $ 472,897 | $ 539,566 | $ 530,395 | $ 694,106 | $ 685,380 | $ 639,868 | $ 632,860 | $ 618,938
Total liabilities | 105,065 | 193,599 | 205,196 | 381,734 | 393,306 | 347,777 | 352,884 | 354,949
Total shareholders' equity | 367,832 | 345,967 | 325,199 | 312,372 | 292,074 | 292,091 | 279,976 | 263,989
Total liabilities and shareholders' equity | 472,897 | 539,566 | 530,395 | 694,106 | 685,380 | 639,868 | 632,860 | 618,938
Previously Reported [Member] |  |  |  |  |  |  |  |
Interim Reporting [Line Items] |  |  |  |  |  |  |  |
Total assets | 504,281 | 565,073 | 553,320 | 707,586 | 704,472 | 656,073 | 647,026 | 631,284
Total liabilities | 105,183 | 187,463 | 199,104 | 369,178 | 389,301 | 345,130 | 349,116 | 354,201
Total shareholders' equity | 399,098 | 377,610 | 354,216 | 338,408 | 315,171 | 310,943 | 297,910 | 277,083
Total liabilities and shareholders' equity | 504,281 | 565,073 | 553,320 | 707,586 | 704,472 | 656,073 | 647,026 | 631,284
Adjustments [Member] |  |  |  |  |  |  |  |
Interim Reporting [Line Items] |  |  |  |  |  |  |  |
Total assets | (31,384) | (25,507) | (22,925) | (13,480) | (19,092) | (16,205) | (14,166) | (12,346)
Total liabilities | (118) | 6,136 | 6,092 | 12,556 | 4,005 | 2,647 | 3,768 | 748
Total shareholders' equity | (31,266) | (31,643) | (29,017) | (26,036) | (23,097) | (18,852) | (17,934) | (13,094)
Total liabilities and shareholders' equity | $ (31,384) | $ (25,507) | $ (22,925) | $ (13,480) | $ (19,092) | $ (16,205) | $ (14,166) | $ (12,346)

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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