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Long-term debt - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 12, 2011 Senior Secured Notes [Member] | Jun. 30, 2011 Senior Secured Notes [Member] | Mar. 31, 2013 Senior Secured Notes [Member] | Apr. 12, 2011 Senior Secured Credit Note [Member] | Apr. 12, 2011 Subordinated Note [Member] | Mar. 31, 2013 Senior Secured Notes [Member] | Mar. 31, 2012 Senior Secured Notes [Member] | Dec. 31, 2011 Senior Secured Notes [Member] | Nov. 30, 2011 Senior Secured Notes [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 |  | 4,600,000 |  |  |  |  |  |  |
Term of payments of interest on notes | Semi-annually |  |  |  |  |  |  |  |
Private placement date | Apr. 12, 2011 |  |  |  |  |  |  |  |
Repurchase of notes |  |  |  |  |  |  |  |  | 5,000,000
Repurchase of notes at cost |  |  |  |  |  |  |  |  | 4,700,000
Gain on repurchase notes |  |  |  |  |  |  |  | 300,000 |
Interest expense on note |  |  |  |  |  | 4,300,000 | 4,300,000 |  |
Senior Notes Trading value |  |  | 107.56 |  |  |  |  |  |
Senior Notes base value |  |  | $ 100 |  |  |  |  |  |

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