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Other Comprehensive Income - Summary of Other Comprehensive Income (Loss) and Tax Impact (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Amounts Reclassified Out Of Accumulated Other Comprehensive Income Loss [Abstract]
Net unrealized (loss) gain on available-for-sale securities, net of income taxes	$ (216)	$ (19)	$ (175)	$ 120
Net unrealized gain (loss) on interest rate swaps, net of income taxes	78	(50)	143	(93)
Foreign currency translation	(17)	(15)	(31)	(31)
Total other comprehensive loss	$ (155)	$ (84)	$ (63)	$ (4)

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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