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Equity - Additional Information (Detail) (USD $) | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 18, 2012 | May 09, 2012 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 | Apr. 01, 2013 | Dec. 31, 2011
Statement of Equity [Line Items] |  |  |  |  |  |  |
Common stock authorized |  |  |  | 206,000,000 | 206,000,000 | 206,000,000 |
Common stock par value |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01
Common stock outstanding |  |  |  | 72,846,144 | 81,876,332 |  |
Preferred stock authorized |  |  |  | 2,000,000 | 2,000,000 | 2,000,000 |
Preferred stock par value |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01
Special dividend declared to stockholders | $ 53,400,000 |  |  |  |  |  |
Excess over accumulated earnings of cash distribution | 52,400,000 | 260,200,000 |  |  |  |  |
Special cash distribution to stockholders |  | $ 269,800,000 | $ 269,772,000 | $ 319,959,000 |  |  |
Common Class A |  |  |  |  |  |  |
Statement of Equity [Line Items] |  |  |  |  |  |  |
Common stock authorized |  |  |  | 99,000,000 |  |  |
Common stock outstanding |  |  |  | 72,776,864 |  |  | 72,628,332
Class B Non-Voting Common Stock |  |  |  |  |  |  |
Statement of Equity [Line Items] |  |  |  |  |  |  |
Common stock authorized |  |  |  | 4,000,000 |  |  |
Common stock outstanding |  |  |  | 72,776,864 |  |  | 72,628,332
Scenario, Previously Reported |  |  |  |  |  |  |
Statement of Equity [Line Items] |  |  |  |  |  |  |
Common stock authorized |  |  |  | 103,000,000 |  |  | 103,000,000
Common stock outstanding |  |  |  | 72,776,864 |  |  | 72,628,332
Preferred stock authorized |  |  |  | 1,000,000 |  |  | 1,000,000

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- Definition Amount of decrease in additional paid in capital (APIC) resulting from dividends legally declared (or paid) in excess of retained earnings balance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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