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Commitments and Contingencies - Additional Information (Detail) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Loss Contingencies [Line Items] | |||
| Accrual for the probable payment of pending claims | $ 19,026,000 | ||
| Operating leases rent expenses | 10,349,000 | 9,184,000 | 5,553,000 |
| Total future minimum lease obligation | 7,337,000 | ||
| Future minimum lease obligation payment period | 6 years | ||
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Fair Value, Inputs, Level 3
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| Loss Contingencies [Line Items] | |||
| Fair value of contingent purchase price commitments | $ 12,701,000 | $ 6,874,000 | |