Accounts Receivable - Additional Information (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Provision for bad debt | $ 2,945 | $ 3,096 | $ 1,047 |
| General and administrative expenses | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Provision for bad debt | $ 2,900 | $ 3,100 | $ 1,000 |