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Accounts Receivable - Additional Information (Detail) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Receivables [Abstract] | |||
| Allowance for doubtful accounts | $ 6,268,000 | $ 5,866,000 | |
| Recognized bad debt expense | 1,100,000 | 300,000 | |
| Allowance for doubtful account, benefit recognized | $ 3,000,000 | ||