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Acquisitions - Summary of Purchase Price Allocation for Company's Acquisition of LER (Detail) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Business Acquisition [Line Items] | ||
| Goodwill | $ 36,647,000 | $ 36,647,000 |
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LER [Member]
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| Business Acquisition [Line Items] | ||
| Cash and cash equivalents | 500,000 | |
| Trade accounts receivable | 2,100,000 | |
| Prepaids and other assets | 100,000 | |
| Property and equipment | 100,000 | |
| Intangible assets subject to amortization | 500,000 | |
| Goodwill | 700,000 | |
| Current liabilities | (1,800,000) | |
| Total | $ 2,200,000 |