Fair Value Measurements - Summary of Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial liabilities:
Long-term debt	$ 823,168
Senior Notes
Financial liabilities:
Long-term debt	366,859	$ 366,043
Term Loan
Financial liabilities:
Long-term debt	406,047	408,410
Carrying Amount
Financial assets:
Cash and cash equivalents	61,029	78,278
Restricted cash	2,414	5,271
Financial liabilities:
Acquisition-related contingent considerations	496	529
Carrying Amount | Senior Notes
Financial liabilities:
Long-term debt	366,859	366,043
Carrying Amount | Term Loan
Financial liabilities:
Long-term debt	406,047	408,410
Carrying Amount | Credit Facility
Financial liabilities:
Long-term debt	26,977	90,967
Fair Value
Financial assets:
Cash and cash equivalents	61,029	78,278
Restricted cash	2,414	5,271
Financial liabilities:
Acquisition-related contingent considerations	496	529
Fair Value | Senior Notes
Financial liabilities:
Long-term debt	397,500	367,500
Fair Value | Term Loan
Financial liabilities:
Long-term debt	423,858	419,796
Fair Value | Credit Facility
Financial liabilities:
Long-term debt	$ 29,000	$ 93,500