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Acquisitions - Summary of Purchase Price Allocation (Parenthetical) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 13, 2011
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]
Cash consideration	$ 14,956	$ 15,044
Escrow cash receivables		88
Additional payment received in cash consideration		384
Fair value obligation of business combination	0	326
Revenue recognized from reversal of contingent liability	326
Restricted units [Member]
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]
Number of units/shares issued	559,020
Management Employees [Member]
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]
Cash consideration for Management employees	$ 2,482

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Amount of cash paid to acquire the entity.

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Number of shares of equity interests issued or issuable to acquire entity.

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The amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity.

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Amounts due to recorded owners or owners with a beneficial interest of more than 10 percent of the voting interests or officers of the company.

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