Debt and Short-Term Borrowings - Total Debt (Detail) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Note payable	$ 2,400	$ 3,400
Total debt	662,129	650,759
Note Payable due on October 1, 2017
Debt Instrument [Line Items]
Note payable	772	1,524
Note Payable due on July 31, 2017
Debt Instrument [Line Items]
Note payable	372	357
Note Payable due on August 31, 2019 \| Notes Payable
Debt Instrument [Line Items]
Total debt	$ 740	890
Fixed interest rate	7.50%
Note Payable due on April 30, 2021
Debt Instrument [Line Items]
Note payable	$ 476	532
Term A due on April 17, 2018 \| Credit Facility
Debt Instrument [Line Items]
Credit facility	$ 27,894	28,721
Term A due on April 17, 2018 \| Credit Facility \| LIBOR
Debt Instrument [Line Items]
Margin interest rate	2.25%
Term A due January 17, 2020 \| Credit Facility
Debt Instrument [Line Items]
Credit facility	$ 206,657	212,661
Term A due January 17, 2020 \| Credit Facility \| LIBOR
Debt Instrument [Line Items]
Margin interest rate	2.50%
Term B due on April 17, 2020 \| Credit Facility
Debt Instrument [Line Items]
Credit facility	$ 377,218	378,074
Term B due on April 17, 2020 \| Credit Facility \| LIBOR
Debt Instrument [Line Items]
Margin interest rate	2.50%
Minimum variable rate	0.75%
Senior Secured Revolving Credit Facility \| Credit Facility
Debt Instrument [Line Items]
Note payable	$ 48,000	$ 28,000
Senior Secured Revolving Credit Facility \| Credit Facility \| LIBOR
Debt Instrument [Line Items]
Margin interest rate	2.50%

Debt Instrument, Interest Rate, Variable Rate Floor

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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+ References

No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(a)(16))
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- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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