Business Segments and Geographic Areas - Summary of Company's Revenues from External Customers and Long-Lived Assets, by Geographical Areas (Detail) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Total operating revenues | $ 144,853 | $ 158,093 | $ 167,136 | $ 164,016 | $ 186,751 | $ 214,733 | $ 198,547 | $ 204,197 | $ 634,098 | $ 804,228 | $ 836,270 |
| Total Long-Lived Assets | 903,977 | 883,529 | 903,977 | 883,529 | |||||||
| United States [Member] | |||||||||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Total operating revenues | 579,300 | 722,339 | 747,063 | ||||||||
| Total Long-Lived Assets | 751,290 | 773,939 | 751,290 | 773,939 | |||||||
| International [Member] | |||||||||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Total operating revenues | 54,798 | 81,889 | $ 89,207 | ||||||||
| Total Long-Lived Assets | $ 152,687 | $ 109,590 | $ 152,687 | $ 109,590 | |||||||