Intangible Assets - Schedule of Changes in the Carrying Amounts of Intangible Assets (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Finite-lived Intangible Assets [Roll Forward] | |||
| Beginning Balance | $ 97,270 | $ 107,155 | |
| Amortization | (9,874) | (9,885) | $ (9,907) |
| Impairment | (534) | ||
| Ending Balance | 86,862 | 97,270 | 107,155 |
| Customer Relationships | |||
| Finite-lived Intangible Assets [Roll Forward] | |||
| Beginning Balance | 91,382 | 100,198 | |
| Amortization | (8,804) | (8,816) | |
| Impairment | (534) | ||
| Ending Balance | $ 82,044 | $ 91,382 | 100,198 |
| Weighted average remaining amortization period | 9 years 5 months | 10 years 5 months | |
| Trademark/ Tradename | |||
| Finite-lived Intangible Assets [Roll Forward] | |||
| Beginning Balance | $ 5,888 | $ 6,957 | |
| Amortization | (1,070) | (1,069) | |
| Impairment | 0 | ||
| Ending Balance | $ 4,818 | $ 5,888 | $ 6,957 |
| Weighted average remaining amortization period | 4 years 5 months 24 days | 5 years 5 months 24 days | |