Allocation of Depreciation and Amortization Expense between Cost of Services and Selling, General and Administrative Expenses (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Property, Plant and Equipment [Line Items] | |||
| Total depreciation and amortization | $ 8,462 | $ 6,047 | $ 6,823 |
| Cost of services | |||
| Property, Plant and Equipment [Line Items] | |||
| Total depreciation and amortization | 7,536 | 4,603 | 4,697 |
| Selling, general and administrative | |||
| Property, Plant and Equipment [Line Items] | |||
| Total depreciation and amortization | $ 926 | $ 1,444 | $ 2,126 |