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Long-term debt - Schedule of Long-Term Debt (Parenthetical) (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended
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Dec. 31, 2011 | Apr. 12, 2011 Senior Secured Notes [Member] | Jun. 30, 2011 Senior Secured Notes [Member] | Apr. 12, 2011 Senior Secured Credit Note [Member] | Jun. 30, 2011 Senior Secured Credit Note [Member] | Dec. 31, 2006 Senior Secured Credit Note [Member] | Apr. 12, 2011 Subordinated Note [Member] | Jan. 14, 2008 Subordinated Note [Member] | Jun. 30, 2011 Subordinated Note [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Issuance of private placement, Principal amount |  | $ 200,000,000 |  |  |  |  |  |  |
Interest rate |  | 8.75% |  |  |  |  |  |  |
Retirement Of Notes, Principal amount |  |  |  | 22,400,000 |  |  | 100,000,000 |  |
Cost to issue the Notes | 4,565,000 |  | 4,600,000 |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  | 344,000 |  |  |  |
Effective portion of the net loss |  |  |  |  |  |  |  |  | 1,300,000
Term of payments of interest on notes |  | Semi-annually |  |  |  |  |  |  |
Private placement date |  | Apr. 12, 2011 |  |  |  |  |  |  |
Issuance of senior secured credit note, Principal amount |  |  |  |  |  | 125,000,000 |  |  |
Term of Senior Secured Credit Note |  |  |  |  |  | 7 years |  |  |
Issuance of subordinate note, Principal amount |  |  |  |  |  |  |  | $ 100,000,000 |

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